Hey X0R! As a TRANS main I'll give my thoughts on your ideas.
Gameplay functions preferably should be accessable via GUI (weapon slots, mapped keys or sub menue). Is this something that is possible? Otherwise the function might not be used much, outside of us forum dwellers.
Airlift: Loading objects by action might be a great way to flesh Logisitcs out. I like the necessity to physically load cargo - and not waiting in special zone for it to magically appear in your asset like we are now.
AirToAir: This seems like a programatically challenging fun idea but it would seem out of place because in flight rearm/repair is not something being done irl. I know this is a game but I believe that functions are only so much game-y because of engine limitations. At some point it has to be abstracted otherwise there is no end. While fuel is not something we have in game I feel that there would be no appreciation or place for a fictional method.
Ticket Cost: 100 is a bit too high. The situation on VG COOP is that tickets, right now, don't matter so assuming we would be on the default 1000 tickets (uhh is that vanilla?) a tenth seems high. If anyting tickets were never taxed when doing anything logistical so I'd say make it free, but rearm times back at the real resupply point way longer.
Additional notes:
Ok, I fully agree that the Ospey should be given unique capabilites. What I would love to see is the vehilce drop feature for the big bird. Combined with your un/-loading script it would seem possible from a laymans POV. For gameplay purposes it would be cool to be able to request, say a TOW hummer from TRANS . The Opsprey would go pick it up from the deck or mainbase and deliver it to the squad. This would feel authentic and remove the inevitable respawn at main when your motorized squad wrecks one of the vehicles.
(Maybe no visible vehicle but hey...)
Maybe expand this to the chinook, so CAD and Army get something to lift too.
Cheers!