nope, can't say I have.... on a plane that is
however I was once upgraded to first class for free on a train out of York heading to Manchester Airport (run by the now defunct Northern Spirit/Arriva Trains Northern transpenninexpress), as it was severely delayed due to a "possession" on the lines or something like that, and I, and the group I was with at the time, as a result missed the flight but the airline were kind enough to let our group onto the next flight, although on the plane we had to make do with standard class, same applied to the train ride from Manchester airport after landing back in the UK some 2 weeks later
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Thanks Tinkerbell.
Allegedly away with the fairies for 6-7 years