Which list of flights, the user side cards or the admin side? And what subfleet information are you looking for?
If the user cards then try this:
After this line: https://github.com/nabeelio/phpvms/blob/dev/resources/views/layouts/default/flights/table.blade.php#L57
Add this:
<h5 class="pt-2 mb-0">Available Subfleets:</h5>
@if($flight->subfleets)
@foreach($flight->subfleets as $subfleet)
<span class="title">FLEET: </span>
{{ $subfleet->type }} - {{ $subfleet->name }}
<br />
@endforeach
@endif