Hi, I am in the fortunate position in that I look after a Bell 412 (in Air Ambulance configuration), that runs on JetA1. We drain at least 2 litres a day from the aircraft, and the storage tanks for testing. And as Rjbob said, it can't re used. Lucky Me
I believe most aircraft operators would be the same, and would probablly be happy to give it to someone to used, rather than paying for disposal.
Cheers,
Greg