All 79 of Alaska's 737-900ER aircraft have Space Bins, which hold as many as 174 standard carry-on bags, a 48 percent increase compared to traditional overhead bins that hold up to 117 bags.
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If overhead bins are full, ask the crew for help finding space. The worst that happens is that your luggage is checked for the trip at no charge.
If your carry-on is oversized (and doesn't physically fit inside the overhead compartments) or you encounter a strict airline employee, they will ask you to check it in at the gate.
Including handles and wheels, the maximum dimensions for a carry-on are 22 inches long, 14 inches wide and 9 inches high. Personal items are limited to 17 inches long, 10 inches wide and 9 inches high.
A personal item must fit under the seat in front of you. If you're not prepared to pay for a cabin bag that goes in the overheads then don't try to take advantage.
The standard carry-on size for international carriers is slightly smaller than that of the U.S., measuring overall at 21.7 by 15.7 by 9 inches, including handles and wheels. Here are the carry-on policies for economy passengers on major international carriers: Air Canada: 21.5 by 15 by 9 inches.
Your carry-on must not exceed the size requirements, and you must store it in the overhead compartments during the flight. Southwest Airlines' carry-on size is 24 x 16 x 10 inches (61 x 41 x 25 cm). If your bag exceeds these dimensions, it will have to be checked.