Just looking at the pics of the Air America choppers and the ex Southern ones being pushed over the sides of the carriers, I remember reading somewhere that the North Vietnamese captured a huge number of Hueys and F-5's at the end of the war and most of them were put into Vietnamese service, kept going by cannibalising others for parts and that for many years after the end of the war, the Vietnamese military was one of the largest Huey operators in the world. Was this true?
I know on the Hancock no Air America Huey's were pushed overboard. I wuz there!
Probally the North kept some aircraft.
I know the USS Midway went to Thailand and ferried a large number of S. Veitnamese F-5's, Huey's and other aircraft to Guam after the fall of S. Vietnam and Cambodia.
This is a full view of the Midway's flight deck loaded with S. Vietnamese aircraft.
This second link is an excellent source of pics about the Operation Frequent Wind. Some of the pics on this page are misidentified by the author as being taken on the Midway. Some of those mis-IDed pics were taken on the Hancock and Blue Ridge.
The pic ture below is a pic of aircraft off loaded in Guam heading out to sea to be sunk.