Group sub-fleets/aircrafts (Feature request)

[avs-code]

Is your feature request related to a problem? Please describe. No

Describe the solution you'd like Imagine that you have many aircraft in many subfleets, but they are clearly grouplable by aircraft type, commuter, regional and long haul.

When you create a new flight, actually you must asign a subfleets (if you have much it can be very tedious). Solution: if you want that this route can be fly for all subfleets type commuter you select commuter and this group include all subfleets type commuter (PC-6, BN-2A, TBM-850, Cessna 208B, PC-12, DHC-6 Twin Otter, etc.) In resume, include an option to create groups of subfleets, the user decide if want it by type, hub or other groupings.

fleet -> group of airplanes/subfleets -> subfleets -> aircrafts.

Describe alternatives you've considered blank

Additional context blank