Why are flight tickets so expensive right now? Increased oil prices seems like it’d be the obvious answer. That’s mostly right. Airlines used to do some financial magic to help keep airfare down as oil prices increased, a strategy called “fuel hedging.” But they stopped. And now fliers are on the hook for a lot of the difference.

On today’s show, the lost art of fuel hedging. How it worked, plus why airlines stopped doing it.

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For sponsor-free episodes of The Indicator from Planet Money, subscribe to Planet Money+ via Apple Podcasts or at plus.npr.org. Fact-checking by Sierra Juarez. Music by Drop Electric. Find us: TikTok, Instagram, Facebook, Newsletter.