Airlines calculate carry-on luggage size measurements using two methods: Height by width by depth: Most – but not all – airlines measure bags by inches or centimeters using this formula ...

As for carry-on bags, those are an entirely different world of fees and size restrictions – you can find information for major American and international airlines in a separate U.S. News guide ...

The carry-on size limit for many airlines is 22 x 14 x 9 inches. Most domestic airlines do not have a weight limit for carry-on bags. You can typically bring a carry-on bag in addition to a ...