However, some domestic airlines, such as Frontier Airlines and Southwest Airlines, permit 24-inch luggage as a carry-on. Why the specific size limit? Primarily, it ensures that your bag—and ...

Southwest.com does not list a weight limit for carry-on bags and personal items. They can fly as long as they meet the size requirements. New way to fly from Hawaii: Phoenix gets new Southwest red ...

However, the rules can vary by airline. For example, American Airlines' carry-on luggage size is 22 x 14 x 9, while Southwest allows a slightly larger carry-on measuring 24 x 16 x 10. While carry ...