I think it would be cool if there was a way you could house passengers in your plane. They could be two types: commercial or military. Commercial passengers earn you a currency that you can buy special parts with (idk what those would be, maybe really fast engines that don’t use a lot of fuel) when they fly with you. Military passengers also earn you this currency and can parachute out. You could also have special airports (or for military, drop zones) to fly the passengers. This would transform SimplePlanes into a lot more fun game.