Southwest Airlines passengers have a reason to double-check their carry-on luggage before their next flight—and it has nothing to do with a new baggage fee.
An October 12 report from Simple Flying raises a potential conflict between Southwest’s generous carry-on dimensions and newer airport security scanners. A suitcase that meets the airline’s rules could still require special handling at certain TSA checkpoints, although a widespread problem has not been established.
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Southwest Allows Bigger Bags Than Many Rivals
According to Southwest’s official baggage policy, passengers can bring a carry-on measuring up to 24 inches long, 16 inches wide and 10 inches high.
The airline states: “You may bring one carryon bag and one personal item onboard.”
Its policy also specifies: “Wheels, handles, and any attachments count toward these dimensions.”
That allowance is larger than the 22-by-14-by-9-inch limit commonly used by other major U.S. airlines, giving Southwest customers more room to pack without checking a suitcase.
But the potential complication comes before passengers ever reach the aircraft.
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New TSA Scanners Raise a Different Question
The Transportation Security Administration has been deploying computed tomography scanners that produce three-dimensional images of luggage contents.
According to the agency’s Checkpoint Requirements and Planning Guide, these systems use “three-dimensional images of bag contents to assist in identifying prohibited or dangerous items.”
The TSA also explains that its checkpoint systems include different configurations, meaning equipment and screening procedures are not identical everywhere.
That distinction matters for travelers carrying larger suitcases. A bag permitted by Southwest might require alternative screening if it cannot pass through a particular scanner or its associated equipment.
However, TSA has not announced a blanket prohibition on Southwest’s permitted carry-on dimensions.
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What Southwest Passengers Should Do Before Flying
Southwest advises customers to “Measure carefully before you fly!”
Its policy also warns: “If your bag is too large to carry on or you’re bringing more than one carryon or personal item, be sure to check item(s) at the ticket counter before you head to your departure gate.”
For now, passengers should measure their bags, including wheels and handles, and follow TSA officers’ instructions if additional screening is needed.
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