Carry on policies per the respective airline websites as of June 8, 2018 Alaska/Horizon/SkyWest : The carry-on bag size limit for Alaska Airlines, Horizon, and SkyWest flights has changed to 22'' x 14'' x 9'' or no more than 45 linear inches. American : Shouldn't exceed 22 x 14 x 9 inches / 56 x 36 x 23 centimeters (including handles and wheels) Delta : Baggage must meet carry on size limits (approximately 22" x 14" x 9" or 56 x 35 x   23 cm). Reference size check templates located at ticket counters and gates. Frontier : Carry-on bags can be no larger than 24"H, 16"W, 10"D (including handles, wheels, and straps) and no heavier than 35 pounds. Carry-on bags must fit in the overhead bin. Carry-on bag charges vary based on when you purchase and fees are non-refundable. Hawaiian : 22" length x 14" width x 9" height (45 linear inches), Maximum weight: 25 pounds (11.5 kg) Jet Blue : All carry-on bags must ...