"Bust one of frank's choppers out of the police impound"
frank has had a helicopter impounded by the FBI, but the worst thing is that there was a USB stick under the passenger seat. Head to the airport to locate the chopper.
Once you arrive, the police initially think that you're with the forensics department. Once it becomes clear that you don't, however, you will need to clear the runway of police before stealing the helicopter.
get in the pilot's seat, then you need to lose the cops. Luckily this is really easy in a helicopter, so just take off and fly for a bit to ditch them. Then, you need to land it on top of frank's Casino, on the helipad indicated, to complete the mission.
Reward: G130,000, Respect: 535,000