Frontier and Southwest keep 24‑inch carry‑on limit as TSA CT scanners measure about 24.5
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Frontier Airlines and Southwest Airlines both list a cabin‑bag size limit of 24 by 16 by 10 inches, including handles, wheels and straps, with Frontier also capping weight at 35 lb.
The Transportation Security Administration’s new computed tomography scanners have tunnel openings of roughly 24.5 inches wide by 16.5 inches high, leaving about half an inch of clearance, and the agency had installed 1,162 CT units at 296 airports by 6 July 2026. The TSA notes that not all larger carry‑ons will fit and advises travelers to verify oversized items with the airline.