The RAF Ensign was lowered to be replaced by the Joint Helicopter flag
A flag-lowering ceremony has been held to mark the end of RAF Aldergrove's 91-year history as an air force base.
The Ministry of Defence announced last year it was relocating 230 Squadron to RAF Benson in Oxfordshire.
About 700 RAF personnel are based at Aldergrove. When the transition ends next March, about 80 will remain.
Current personnel and veterans gathered to watch a low-level pass by three Harrier jets to honour all the pilots who had flown out of the airfield.
The Joint Helicopter Command Flying Station will continue to operate from Aldergrove, and civilian workers will remain in employment.
During the ceremony, there was a symbolic lowering of the RAF Ensign which was replaced by the Joint Helicopter flag.
Sunday's events also included a church service and a parade commemorating the Battle of Britain.