* Update SubFleet Model
Add hub_id for storing subfleet's main base/hub airport, define a relationship with airport model to get details of the base/hub airport when needed.
* Update Admin / SubFleetController
Added the ability to read and pass hub airports to admin view for create/edit options.
* Update Admin/SubFleets.fields.blade
Added the dropdown for adding/editing main base/hub of a subfleet.
* Add migration for the hub_id column
Co-authored-by: Nabeel S <nabeelio@users.noreply.github.com>
Co-authored-by: Nabeel Shahzad <nshahzad@live.com>