Not sure if you can alter this in-game or not... but in any case, wouldn't be very realistic... major airdrops are conducted by using multiple large transport aircraft, none of which can operate from carriers (WWII or modern)...
You'd probably be better-off making a more modern Paratrooper that has a longer range then the default-5, to represent more modern long-range transport aircraft.... this is easy to do in the unit XML.