diff --git a/app/Database/factories/FlightFactory.php b/app/Database/factories/FlightFactory.php
index 83776e99..b4d81fb1 100644
--- a/app/Database/factories/FlightFactory.php
+++ b/app/Database/factories/FlightFactory.php
@@ -26,6 +26,8 @@ $factory->define(App\Models\Flight::class, function (Faker $faker) use ($airline
         },
         'distance'       => $faker->numberBetween(0, 3000),
         'route'          => null,
+        'days'           => 0,
+        'level'          => 0,
         'dpt_time'       => $faker->time(),
         'arr_time'       => $faker->time(),
         'flight_time'    => $faker->numberBetween(60, 360),
diff --git a/app/Database/migrations/2017_06_17_214650_create_flight_tables.php b/app/Database/migrations/2017_06_17_214650_create_flight_tables.php
index b6c016e2..ed8c729d 100644
--- a/app/Database/migrations/2017_06_17_214650_create_flight_tables.php
+++ b/app/Database/migrations/2017_06_17_214650_create_flight_tables.php
@@ -24,6 +24,7 @@ class CreateFlightTables extends Migration
             $table->string('alt_airport_id', 5)->nullable();
             $table->string('dpt_time', 10)->nullable();
             $table->string('arr_time', 10)->nullable();
+            $table->unsignedTinyInteger('days')->nullable();
             $table->unsignedInteger('level')->nullable()->default(0);
             $table->unsignedDecimal('distance')->nullable()->default(0.0);
             $table->unsignedInteger('flight_time')->nullable();
diff --git a/app/Http/Controllers/Admin/FlightController.php b/app/Http/Controllers/Admin/FlightController.php
index 052082e0..571e0e64 100644
--- a/app/Http/Controllers/Admin/FlightController.php
+++ b/app/Http/Controllers/Admin/FlightController.php
@@ -5,6 +5,7 @@ namespace App\Http\Controllers\Admin;
 use App\Http\Requests\CreateFlightRequest;
 use App\Http\Requests\UpdateFlightRequest;
 use App\Interfaces\Controller;
+use App\Models\Enums\Days;
 use App\Models\Enums\FlightType;
 use App\Models\Flight;
 use App\Models\FlightField;
@@ -143,6 +144,7 @@ class FlightController extends Controller
     {
         return view('admin.flights.create', [
             'flight'        => null,
+            'days'          => [],
             'flight_fields' => $this->flightFieldRepo->all(),
             'airlines'      => $this->airlineRepo->selectBoxList(),
             'airports'      => $this->airportRepo->selectBoxList(true, false),
@@ -179,6 +181,7 @@ class FlightController extends Controller
             return redirect()->back()->withInput($request->all());
         }
 
+        $input['days'] = Days::getDaysMask($input['days']);
         $input['active'] = get_truth_state($input['active']);
 
         $time = new Time($input['minutes'], $input['hours']);
@@ -232,6 +235,7 @@ class FlightController extends Controller
 
         return view('admin.flights.edit', [
             'flight'          => $flight,
+            'days'            => $flight->days,
             'flight_fields'   => $this->flightFieldRepo->all(),
             'airlines'        => $this->airlineRepo->selectBoxList(),
             'airports'        => $this->airportRepo->selectBoxList(),
@@ -279,6 +283,8 @@ class FlightController extends Controller
             return redirect()->back()->withInput($request->all());
         }
 
+        $input['days'] = Days::getDaysMask($input['days']);
+
         $input['flight_time'] = Time::init(
             $input['minutes'],
             $input['hours'])->getMinutes();
diff --git a/app/Interfaces/Enum.php b/app/Interfaces/Enum.php
index eaa93773..fc82547e 100644
--- a/app/Interfaces/Enum.php
+++ b/app/Interfaces/Enum.php
@@ -67,12 +67,7 @@ abstract class Enum
      */
     public static function getFromCode($code)
     {
-        $code = strtoupper($code);
-        if(!array_key_exists($code, static::$codes)) {
-            return null;
-        }
-
-        return static::$codes[$code];
+        return array_search($code, static::$codes, true);
     }
 
     /**
@@ -82,7 +77,12 @@ abstract class Enum
      */
     public static function convertToCode($value)
     {
-        return array_search($value, static::$codes, true);
+        $value = (int) $value;
+        if (!array_key_exists($value, static::$codes)) {
+            return null;
+        }
+
+        return static::$codes[$value];
     }
 
     /**
diff --git a/app/Models/Enums/AircraftStatus.php b/app/Models/Enums/AircraftStatus.php
index 1cd3af33..16d3f8bb 100644
--- a/app/Models/Enums/AircraftStatus.php
+++ b/app/Models/Enums/AircraftStatus.php
@@ -25,10 +25,10 @@ class AircraftStatus extends Enum
     ];
 
     public static $codes = [
-        'S' => AircraftStatus::STORED,
-        'A' => AircraftStatus::ACTIVE,
-        'R' => AircraftStatus::RETIRED,
-        'C' => AircraftStatus::SCRAPPED,
-        'W' => AircraftStatus::WRITTEN_OFF,
+        AircraftStatus::STORED      => 'S',
+        AircraftStatus::ACTIVE      => 'A' ,
+        AircraftStatus::RETIRED     => 'R',
+        AircraftStatus::SCRAPPED    => 'C',
+        AircraftStatus::WRITTEN_OFF => 'W',
     ];
 }
diff --git a/app/Models/Enums/Days.php b/app/Models/Enums/Days.php
index a38213ba..92ce6848 100644
--- a/app/Models/Enums/Days.php
+++ b/app/Models/Enums/Days.php
@@ -6,6 +6,7 @@ use App\Interfaces\Enum;
 
 /**
  * Class Days
+ * Start on Monday - ISO8601
  * @package App\Models\Enums
  */
 class Days extends Enum
@@ -18,7 +19,7 @@ class Days extends Enum
     public const SATURDAY  = 1 << 5;
     public const SUNDAY    = 1 << 6;
 
-    protected static $labels = [
+    public static $labels = [
         Days::MONDAY    => 'system.days.mon',
         Days::TUESDAY   => 'system.days.tues',
         Days::WEDNESDAY => 'system.days.wed',
@@ -27,4 +28,40 @@ class Days extends Enum
         Days::SATURDAY  => 'system.days.sat',
         Days::SUNDAY    => 'system.days.sun',
     ];
+
+    public static $codes = [
+        'M'  => Days::MONDAY,
+        'T'  => Days::TUESDAY,
+        'W'  => Days::WEDNESDAY,
+        'Th' => Days::THURSDAY,
+        'F'  => Days::FRIDAY,
+        'S'  => Days::SATURDAY,
+        'Su' => Days::SUNDAY,
+    ];
+
+    /**
+     * Create the masked value for the days of week
+     * @param array $days
+     * @return int|mixed
+     */
+    public static function getDaysMask(array $days)
+    {
+        $mask = 0;
+        foreach($days as $day) {
+            $mask |= $day;
+        }
+
+        return $mask;
+    }
+
+    /**
+     * See if the given mask has a day
+     * @param $mask
+     * @param $day
+     * @return bool
+     */
+    public static function in($mask, $day): bool
+    {
+        return ($mask & $day) === $day;
+    }
 }
diff --git a/app/Models/Enums/ExpenseType.php b/app/Models/Enums/ExpenseType.php
index 9fdb26dc..0330fd0a 100644
--- a/app/Models/Enums/ExpenseType.php
+++ b/app/Models/Enums/ExpenseType.php
@@ -21,8 +21,8 @@ class ExpenseType extends Enum
     ];
 
     protected static $codes = [
-        'F' => ExpenseType::FLIGHT,
-        'D' => ExpenseType::DAILY,
-        'M' => ExpenseType::MONTHLY,
+        ExpenseType::FLIGHT  => 'F',
+        ExpenseType::DAILY   =>'D',
+        ExpenseType::MONTHLY => 'M',
     ];
 }
diff --git a/app/Models/Enums/FlightType.php b/app/Models/Enums/FlightType.php
index 96db4ad0..4dd04b57 100644
--- a/app/Models/Enums/FlightType.php
+++ b/app/Models/Enums/FlightType.php
@@ -21,8 +21,8 @@ class FlightType extends Enum
     ];
 
     protected static $codes = [
-        'P' => FlightType::PASSENGER,
-        'C' => FlightType::CARGO,
-        'H' => FlightType::CHARTER,
+        FlightType::PASSENGER => 'P',
+        FlightType::CARGO     => 'C',
+        FlightType::CHARTER   => 'H',
     ];
 }
diff --git a/app/Models/Enums/FuelType.php b/app/Models/Enums/FuelType.php
index 3e8cf130..5a8ac332 100644
--- a/app/Models/Enums/FuelType.php
+++ b/app/Models/Enums/FuelType.php
@@ -14,7 +14,7 @@ class FuelType extends Enum
     public const JET_A    = 1;
     public const MOGAS    = 2;
 
-    protected static $labels = [
+    public static $labels = [
         FuelType::LOW_LEAD => '100LL',
         FuelType::JET_A    => 'JET A',
         FuelType::MOGAS    => 'MOGAS',
diff --git a/app/Models/Flight.php b/app/Models/Flight.php
index 2b439ef6..c3fa3018 100644
--- a/app/Models/Flight.php
+++ b/app/Models/Flight.php
@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use App\Interfaces\Model;
+use App\Models\Enums\Days;
 use App\Models\Traits\HashIdTrait;
 use App\Support\Units\Distance;
 use Illuminate\Support\Collection;
@@ -18,6 +19,7 @@ use PhpUnitsOfMeasure\Exception\NonStringUnitName;
  * @property Collection field_values
  * @property Collection fares
  * @property Collection subfleets
+ * @property integer    days
  */
 class Flight extends Model
 {
@@ -40,6 +42,7 @@ class Flight extends Model
         'alt_airport_id',
         'dpt_time',
         'arr_time',
+        'days',
         'level',
         'distance',
         'flight_time',
@@ -52,6 +55,7 @@ class Flight extends Model
 
     protected $casts = [
         'flight_number' => 'integer',
+        'days'          => 'integer',
         'level'         => 'integer',
         'distance'      => 'float',
         'flight_time'   => 'integer',
@@ -70,6 +74,22 @@ class Flight extends Model
         'level'          => 'nullable',
     ];
 
+    /**
+     * Return all of the flights on any given day(s) of the week
+     * Search using bitmasks
+     * @param Days[] $days List of the enumerated values
+     * @return Flight
+     */
+    public static function findByDays(array $days)
+    {
+        $flights = Flight::where('active', true);
+        foreach($days as $day) {
+            $flights = $flights->where('days', '&', $day);
+        }
+
+        return $flights;
+    }
+
     /**
      * Get the flight ident, e.,g JBU1900
      */
@@ -125,6 +145,15 @@ class Flight extends Model
         }
     }
 
+    /**
+     * @param $day
+     * @return bool
+     */
+    public function on_day($day): bool
+    {
+        return ($this->days & $day) === $day;
+    }
+
     /**
      * Return a custom field value
      * @param $field_name
diff --git a/app/Services/ImportExport/FlightExporter.php b/app/Services/ImportExport/FlightExporter.php
index 68ecb18c..cb9c992c 100644
--- a/app/Services/ImportExport/FlightExporter.php
+++ b/app/Services/ImportExport/FlightExporter.php
@@ -3,6 +3,7 @@
 namespace App\Services\ImportExport;
 
 use App\Interfaces\ImportExport;
+use App\Models\Enums\Days;
 use App\Models\Enums\FlightType;
 use App\Models\Flight;
 
@@ -39,6 +40,7 @@ class FlightExporter extends ImportExport
         $ret['airline'] = $ret['airline']->icao;
         $ret['distance'] = $ret['distance']->toNumber();
 
+        $ret['days'] = $this->getDays($flight);
         $ret['flight_type'] = FlightType::convertToCode($ret['flight_type']);
 
         $ret['fares'] = $this->getFares($flight);
@@ -48,6 +50,46 @@ class FlightExporter extends ImportExport
         return $ret;
     }
 
+    /**
+     * Return the days string
+     * @param Flight $flight
+     * @return string
+     */
+    protected function getDays(Flight &$flight)
+    {
+        $days_str = '';
+
+        if($flight->on_day(Days::MONDAY)) {
+            $days_str .= '1';
+        }
+
+        if ($flight->on_day(Days::TUESDAY)) {
+            $days_str .= '2';
+        }
+
+        if ($flight->on_day(Days::WEDNESDAY)) {
+            $days_str .= '3';
+        }
+
+        if ($flight->on_day(Days::THURSDAY)) {
+            $days_str .= '4';
+        }
+
+        if ($flight->on_day(Days::FRIDAY)) {
+            $days_str .= '5';
+        }
+
+        if ($flight->on_day(Days::SATURDAY)) {
+            $days_str .= '6';
+        }
+
+        if ($flight->on_day(Days::SUNDAY)) {
+            $days_str .= '7';
+        }
+
+        return $days_str;
+    }
+
     /**
      * Return any custom fares that have been made to this flight
      * @param Flight $flight
diff --git a/app/Services/ImportExport/FlightImporter.php b/app/Services/ImportExport/FlightImporter.php
index 388c34f8..d12e4dc7 100644
--- a/app/Services/ImportExport/FlightImporter.php
+++ b/app/Services/ImportExport/FlightImporter.php
@@ -4,6 +4,7 @@ namespace App\Services\ImportExport;
 
 use App\Interfaces\ImportExport;
 use App\Models\Airport;
+use App\Models\Enums\Days;
 use App\Models\Enums\FlightType;
 use App\Models\Fare;
 use App\Models\Flight;
@@ -83,6 +84,7 @@ class FlightImporter extends ImportExport
         ], $row);
 
         // Airport atttributes
+        $flight->setAttribute('days', $this->setDays($row['days']));
         $flight->setAttribute('dpt_airport_id', $row['dpt_airport']);
         $flight->setAttribute('arr_airport_id', $row['arr_airport']);
         if ($row['alt_airport']) {
@@ -116,6 +118,49 @@ class FlightImporter extends ImportExport
         return true;
     }
 
+    /**
+     * Return the mask of the days
+     * @param $day_str
+     * @return int|mixed
+     */
+    protected function setDays($day_str)
+    {
+        if(!$day_str) {
+            return 0;
+        }
+
+        $days = [];
+        if(strpos($day_str, '1') !== false) {
+            $days[] = Days::MONDAY;
+        }
+
+        if (strpos($day_str, '2') !== false) {
+            $days[] = Days::TUESDAY;
+        }
+
+        if (strpos($day_str, '3') !== false) {
+            $days[] = Days::WEDNESDAY;
+        }
+
+        if (strpos($day_str, '4') !== false) {
+            $days[] = Days::THURSDAY;
+        }
+
+        if (strpos($day_str, '5') !== false) {
+            $days[] = Days::FRIDAY;
+        }
+
+        if (strpos($day_str, '6') !== false) {
+            $days[] = Days::SATURDAY;
+        }
+
+        if (strpos($day_str, '7') !== false) {
+            $days[] = Days::SUNDAY;
+        }
+
+        return Days::getDaysMask($days);
+    }
+
     /**
      * Process the airport
      * @param $airport
diff --git a/app/helpers.php b/app/helpers.php
index 3c51f1d2..c32b029b 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -1,5 +1,18 @@
 <?php
 
+if (!function_exists('in_mask')) {
+    /**
+     * Return true/false if a value exists in a mask
+     * @param $mask
+     * @param $value
+     * @return bool
+     */
+    function in_mask($mask, $value)
+    {
+        return ($mask & $value) === $value;
+    }
+}
+
 if (!function_exists('get_truth_state')) {
     /**
      * Check if the passed state matches any of the states that
diff --git a/resources/views/admin/flights/fields.blade.php b/resources/views/admin/flights/fields.blade.php
index bdc8d242..00148e6d 100644
--- a/resources/views/admin/flights/fields.blade.php
+++ b/resources/views/admin/flights/fields.blade.php
@@ -28,6 +28,74 @@
     </div>
 </div>
 
+<div class="row">
+    <div class="form-group col-md-12" style="text-align: center;">
+        <span style="margin-right: 20px;">
+            {{ Form::label('days[]', 'Monday') }}
+            {{ Form::checkbox(
+                'days[]',
+                \App\Models\Enums\Days::MONDAY,
+                in_mask($days, \App\Models\Enums\Days::MONDAY),
+                ['class' => 'form-control icheck']
+            ) }}
+        </span>
+        <span style="margin-right: 20px;">
+            {{ Form::label('days[]', 'Tuesday') }}
+            {{ Form::checkbox(
+                'days[]',
+                \App\Models\Enums\Days::TUESDAY,
+                in_mask($days, \App\Models\Enums\Days::TUESDAY),
+                ['class' => 'form-control icheck']
+            ) }}
+        </span>
+        <span style="margin-right: 20px;">
+            {{ Form::label('days[]', 'Wednesday') }}
+            {{ Form::checkbox(
+                'days[]',
+                \App\Models\Enums\Days::WEDNESDAY,
+                in_mask($days, \App\Models\Enums\Days::WEDNESDAY),
+                ['class' => 'form-control icheck']
+            ) }}
+        </span>
+        <span style="margin-right: 20px;">
+            {{ Form::label('days[]', 'Thursday') }}
+            {{ Form::checkbox(
+                'days[]',
+                \App\Models\Enums\Days::THURSDAY,
+                in_mask($days, \App\Models\Enums\Days::THURSDAY),
+                ['class' => 'form-control icheck']
+            ) }}
+        </span>
+        <span style="margin-right: 20px;">
+            {{ Form::label('days[]', 'Friday') }}
+            {{ Form::checkbox(
+                'days[]',
+                \App\Models\Enums\Days::FRIDAY,
+                in_mask($days, \App\Models\Enums\Days::FRIDAY),
+                ['class' => 'form-control icheck']
+            ) }}
+        </span>
+        <span style="margin-right: 20px;">
+            {{ Form::label('days[]', 'Saturday') }}
+            {{ Form::checkbox(
+                'days[]',
+                \App\Models\Enums\Days::SATURDAY,
+                in_mask($days, \App\Models\Enums\Days::SATURDAY),
+                ['class' => 'form-control icheck']
+            ) }}
+        </span>
+        <span>
+            {{ Form::label('days[]', 'Sunday') }}
+            {{ Form::checkbox(
+                'days[]',
+                \App\Models\Enums\Days::SUNDAY,
+                in_mask($days, \App\Models\Enums\Days::SUNDAY),
+                ['class' => 'form-control icheck']
+            ) }}
+        </span>
+    </div>
+</div>
+
 <div class="row">
 
     <div class="form-group col-sm-3">
diff --git a/tests/FlightTest.php b/tests/FlightTest.php
index 43c878f0..ae00ae46 100644
--- a/tests/FlightTest.php
+++ b/tests/FlightTest.php
@@ -1,5 +1,6 @@
 <?php
 
+use App\Models\Enums\Days;
 use App\Models\Flight;
 use App\Models\User;
 use App\Models\Bid;
@@ -118,6 +119,41 @@ class FlightTest extends TestCase
         $res->assertJsonCount(5, 'data');
     }
 
+    /**
+     * Test the bitmasks that they work for setting the day of week and
+     * then retrieving by searching on those
+     */
+    public function testFindDaysOfWeek(): void
+    {
+        $this->user = factory(App\Models\User::class)->create();
+        factory(App\Models\Flight::class, 20)->create([
+            'airline_id' => $this->user->airline_id
+        ]);
+
+        $saved_flight = factory(App\Models\Flight::class)->create([
+            'airline_id' => $this->user->airline_id,
+            'days' => Days::getDaysMask([
+                Days::SUNDAY,
+                Days::THURSDAY
+            ])
+        ]);
+
+        $flight = Flight::findByDays([Days::SUNDAY])->first();
+        $this->assertTrue($flight->on_day(Days::SUNDAY));
+        $this->assertTrue($flight->on_day(Days::THURSDAY));
+        $this->assertFalse($flight->on_day(Days::MONDAY));
+        $this->assertEquals($saved_flight->id, $flight->id);
+
+        $flight = Flight::findByDays([Days::SUNDAY, Days::THURSDAY])->first();
+        $this->assertEquals($saved_flight->id, $flight->id);
+
+        $flight = Flight::findByDays([Days::WEDNESDAY, Days::THURSDAY])->first();
+        $this->assertNull($flight);
+    }
+
+    /**
+     *
+     */
     public function testFlightSearchApi()
     {
         $this->user = factory(App\Models\User::class)->create();
diff --git a/tests/ImporterTest.php b/tests/ImporterTest.php
index bd6dcde0..6698f3a4 100644
--- a/tests/ImporterTest.php
+++ b/tests/ImporterTest.php
@@ -230,6 +230,10 @@ class ImporterTest extends TestCase
 
         $flight = factory(App\Models\Flight::class)->create([
             'airline_id' => $airline->id,
+            'days' => \App\Models\Enums\Days::getDaysMask([
+                \App\Models\Enums\Days::TUESDAY,
+                \App\Models\Enums\Days::SUNDAY,
+            ]),
         ]);
 
         $flight->subfleets()->syncWithoutDetaching([$subfleet->id, $subfleet2->id]);
@@ -256,6 +260,7 @@ class ImporterTest extends TestCase
         $exporter = new \App\Services\ImportExport\FlightExporter();
         $exported = $exporter->export($flight);
 
+        $this->assertEquals('27', $exported['days']);
         $this->assertEquals('VMS', $exported['airline']);
         $this->assertEquals('A32X;B74X', $exported['subfleets']);
         $this->assertEquals('Y?capacity=100;F', $exported['fares']);
@@ -376,6 +381,11 @@ class ImporterTest extends TestCase
         $this->assertEquals('Just a flight', $flight->notes);
         $this->assertEquals(true, $flight->active);
 
+        # Test that the days were set properly
+        $this->assertTrue($flight->on_day(\App\Models\Enums\Days::MONDAY));
+        $this->assertTrue($flight->on_day(\App\Models\Enums\Days::FRIDAY));
+        $this->assertFalse($flight->on_day(\App\Models\Enums\Days::TUESDAY));
+
         // Check the custom fields entered
         $fields = \App\Models\FlightFieldValue::where([
             'flight_id' => $flight->id,
diff --git a/tests/data/flights.csv b/tests/data/flights.csv
index c7b47884..2fd3c109 100644
--- a/tests/data/flights.csv
+++ b/tests/data/flights.csv
@@ -1,2 +1,2 @@
 airline,flight_number,route_code,route_leg,dpt_airport,arr_airport,alt_airport,days,dpt_time,arr_time,level,distance,flight_time,flight_type,route,notes,active,subfleets,fares,fields
-VMS,1972,,,KAUS,KJFK,KLGA,,0810 CST,1235 EST,350,1477,207,P,ILEXY2 ZENZI LFK ELD J29 MEM Q29 JHW J70 STENT J70 MAGIO J70 LVZ LENDY6,"Just a flight",1,A32X,Y?price=300&cost=100&capacity=130;F?price=600&cost=400;B?,Departure Gate=4;Arrival Gate=C41
+VMS,1972,,,KAUS,KJFK,KLGA,15,0810 CST,1235 EST,350,1477,207,P,ILEXY2 ZENZI LFK ELD J29 MEM Q29 JHW J70 STENT J70 MAGIO J70 LVZ LENDY6,"Just a flight",1,A32X,Y?price=300&cost=100&capacity=130;F?price=600&cost=400;B?,Departure Gate=4;Arrival Gate=C41