For flyable aircraft, do you have to pay per month, or just once?
Thanks for answering the questions guys.
Just once...
unless you get shot down or crash, in this case you need to buy a new one.... :rofl:... just kidding. You pay
once for every non-standard aircraft, that you intent to fly
yourself, you don't need to pay for having these aircraft as AI aircraft and you don't need to pay if you want to take part in a multiplayer session with other players using such aircraft.
If you wish to fly multiple aircraft with lower simulation fidelity, you take the Flaming Cliffs 3 add-on. Otherwise, you have the choice from quite many pretty detailed aircraft of different decades. Be aware, that the simulation models are really realistic and might be a challenge. Also, you can buy the "Combined Arms" module for being able to drive tanks and to command the ground units of one alliance.