So you like flying, me to, its what I mostly do in Arma 2. There's a couple of things you should know.
First of all the controls, BF3 flying is nothing compared to flying in Arma. It imposes much more realistic flight physics which brings you more freedom but also boasts a lot of new challenges. I play Battlefield to, and in Battlefield you can control you jet with the WASD buttons and the mouse. In Arma you'll need your whole keyboard, and more.
I use a flight stick, a throttle and my mouse and keyboard all at once. It comes much closer to operating in a real cockpit then Battlefield. Next to that, in battlefield you can slow down your jet to speeds where in Arma it would start to stall, you can go much higher and faster but again, this brings challenges. In Battlefield you can almost turn your jet like a car, its easy to use the yaw controls to achieve this, but in Arma you turn fastest by banking and pulling some g's.
Its up to you how realistic you want it, by default its pretty tricky and takes real effort to master it. I use mods that make it even more realistic.
Finally, in Battlefield you can just spray and shoot away all you want and your ammo will magically replenish. In Arma, what you see is what you get. You got 2 missles, 4 bombs and 14 rockets under your wings? That means you can shoot 2 missiles, 4 bombs and 14 rockets.
Pilots are a special breed of gamers and in my opinion a minority. So getting another on board is always great.
Good luck and have fun!!