Never trash your boarding pass — here’s why

Next time you fly, keep your boarding pass. Especially if you collect frequent flier miles. And especially if your airline is playing the codeshare game.

John Hamilton wishes he had. He’s a member of Flying Blue, the loyalty program operated by Air France and KLM. He recently flew on Delta Air Lines, an Air France codeshare partner, and expected to get Flying Blue credit.

He didn’t.
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