Any tips for GTA IV airport fights (Online that is)?

Its normally me Calze, (not my real name obviously,Its my nickname, my actuall name is Callum) My mates connor, kieran and Callum, uhh 2 shall we say. We all get in a 4 seat drive, cruise to the airport, illimanate any threats (or run them over) Get to the chopper all bail in, and go round the place in circles killing people, then come down low and pick up the health for our chopper, and carry on. I was thinking, maybe all of us get a single chopper, and if we are under attack in the air, one guy like, camacarzis. Killing the enemy chopper. then we go and pick them up, anyway what do you do?