Can't speak for all airports but one major U.K will defuel into a bowser and will pump it back into an aircraft owned by same company.
Depends on having a free bowser and the fuel passing the normal pre delivery checks..
Guy walks into hangar at same airport and asks "can anybody use some Jet A".
Thinking some of that would go in with the diesel in my car I ask how much?
9 tonnes!!!!!!
Airliner had done a heavy landing and needed wing repairs hence total defuel.
9 tonnes got sent as waste oil, I'm still crying over that one.
Would have powered my central heating for years.