Impounding airliners at British airports
I can only think of two occasions when this has happened. Firstly, at least one Genair SD330 being seized at Blackpool in 1984 due to non-payment of fees. The other is a Hispania 737 and 757 getting the legal treatment at Leeds Bradford in the summer of 1989. The 737 got a new white paint job for its tailfin too!
I'll add a third although I'm less certain about this one. Southern International towards the end of their life.
In all these cases I don't know if the airlines actually owned the aircraft outright, if mortgagors and banks had interests or if they were simply leased. I wonder if these matters were significant to the creditors?