I flew economy on American, Delta, and United. The flights were strikingly similar but with small quirks that may help you choose which airline to fly.

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For those still stuck between one or more of the three for a particular economy flight, here's my best advice on how to choose. The view of the United cabin from the author's middle seat. Taylor Rains/Business Insider Firstly, if you care most about punctuality, the data says book Delta. Plus, the airline is consistently awarded for its premium-focused service and comfort, so it's just a safe bet — but you may see higher fares because of it. United's upgraded cabin is just as nice as Delta's, and I'd argue it's actually better with the Bluetooth option. But you'll want to pay up for at least regular economy to get a carry-on for domestic flights. While I've had my issues with American in the past, the airline has fully grown on me. It is often among the cheaper options, but most of its narrowbodies don't have a seatback screen. You'll still get entertainment on American but on a handheld device. If you're like me, who watches content on a personal device, I'd say that's a win-win.