Fuel Dumping: A Little-Understood Trick to Save Hundreds of Dollars on Airfare

There’s a fun trick that can help you save hundreds of dollars on your next long flight—but it’s a little complicated and requires a bit of work.

Bloggers get hate mail over sharing this tip (I’m not kidding), presumably because some people feel entitled to keep secrets to themselves. In my opinion, the only reason this loophole hasn’t been closed has nothing to do with its public knowledge but rather that it takes effort and attention to benefit from it.

Basically, “fuel dumping” is a tick...