How is fuel paid/billed during unscheduled stops?

Posted by idkblk@reddit | aviation | View on Reddit | 81 comments

Let's say a plane lands somewhere, where it doesn't have a 'usual business connection' to the airport. Where the respective airline isn't known. Or let it be a private plane, Airforce One or whatever. Probably even a (financially) untrustworthy airline.

How is fuel billed an scheduled? Do pilots carry a fuel credit card like I do for a company car?