[HawaiianGecko]

He lost 4 aircraft.  One during a flameout and ejection over Norfolk, VA. [Timberg, Robert (1999). John McCain: An American Odyssey (paperback), Touchstone Books. ISBN 0-684-86794-X.  pp. 66–68.]
Two, lost engine power and splashed into Corpus Christi Bay [IBID]
Three, the Forrestal event.
Four, being shot out of the sky over N. Vietnam.

[TommyDale]

I was giving him a pass on the one shot down, since that was a legitimate one that he did pay dearly for. They say that if his father had not been a good officer, John McCain would have been tossed out.