Do you think this is wise these days?
Most of us don't think it is wise ever.
Some will say that provided you pay by credit card, so there's a chance the credit card company will pay you back when the school goes bust and takes your money with it, then it's OK. However it might depend on whether the credit card company reckon you've been paying for flying in advance (covered) or providing a banking service to the school (not covered) - ask your lawyer first.