Though some airlines (JetBlue; Alaska) give you a few extra inches here and there, the major domestic carriers are all in agreement: the maximum allowable carry-on bag is 22" x 14" x 9". This standard has been in place for years, but in the past airlines were lenient about ensuring bags adhered to it. United, however, started enforcing its size limits in March. So to play it safe, invest in a suitcase that doesn’t exceed those measurements.
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