Don’t miss the window to check in or you'll be left out.

Remember when the airport theory was trending on TikTok earlier this year? The basic idea was that you can show up at the airport just before your flight takes off, with maybe 15 or 20 minutes to spare. The result: passengers kept missing their flights. And now there’s now another reason to reconsider trying this maneuver yourself. United Airlines has announced changes to its check-in policy. Starting June 3, all passengers must check in at least 45 minutes before departure for domestic flights within the U.S.

Related: The ‘Airport Theory’ TikTok Trend Is Causing Passengers to Miss Their Flights

Whether you’re traveling with checked baggage or not, the time window is the same. Previously, passengers without checked bags had u

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