Even though Helicopter battles can be rewarding for good participation and useful actions, as mentioned by Ravanos you can grind it using ground vehicles.
Unfortunately you have to pay attention to the helicopter rank, unless you have a ground vehicle as premium in high rank, you should receive RP penalties.
Through the all-ground-rp-goes-to-helicopter toggle, or through flying a helicopter in ground (or both)? I’ve been going back and forth on whether or not to play helicopters, but I’m at 9.3 with ground vehicles and I’d have to use the AB 205
I find Heli EC to be relaxing and a good way to burn the x10 and x20 boosters. You get big chunks of SL and RP instead of the nickel and dime from ground random battles.