Don't know if this totally counts, but saw Gordon Bethune (former Continental CEO during the 1990s to early 2000s) on LGA - IAH on 1/29/14 across the aisle, one row up from me in First.
Even though it was a legacy United crew (Airbus plane), the FAs treated him
like a rock star. They asked for his meal order first and Global Services was there to meet him plane side when we landed with a cart if he needed it.
Small overheaded issue on the plane (it wouldn't close above him) and he jokingly offered to fix it and that he still had some licenses (guess he was a mechanic and pilot years ago?) .. he said to use a bobby pin to fix it to latch. Lo and behold.. it worked!