Another tip......
Look out for AA guns on maps note them down if your running around on the ground.
If your getting damage it most likely time to fire at them.
Also don't keep still for too long in the air people will try to RPG you.
Go as a engineer

repair it or have engineers inside.
Don't just spawn attack but keep control of points. Giving ground troops cover.
That all
Once you can fly it best to know how to be useful.