That sounds fair, afterall you can hardly paradrop a tank or a modern armor, so you need to land the flight somewhere in order to get the unit off. Paratroopers should get the ability to paradrop and attack in the same turn. Someone mentioned that recently and I agree. This will give them the option to paradrop behind enemy lines and attack vulnerable ranged units which would be really useful. Also they would be able to paradrop in regions without an airport, which would still make them different than other units.