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Still think you should be able to check a bag or two for free on your next flight? Unfortunately, the airlines don't agree with you. Over the past year, nearly every U.S. airline except Southwest has added fees to check bags on flights within the U.S. -- and many are charging those fees on flights to Canada, the Caribbean and Latin America as well.

To add insult to injury, most airlines have also jacked up their penalties on excess, oversized and overweight luggage, with fees ranging from $50 to a whopping $600.

It's difficult to keep up with these rapidly changing fees, so we're doing it for you! Below is an airline-by-airline roundup of checked bag fees (as well as who's exempt from those fees), excess baggage penalties, and charges for oversized/overweight luggage. Use the links below to jump straight to your favorite airline.

American Airlines
First Checked Bag: $15 each way for economy-class flights within the United States, U.S.V.I., Puerto Rico and Canada booked on or after June 15, 2008. Travelers who booked before this date may check one bag for free.
Second Checked Bag: $25 each way for economy-class flights within the United States, U.S.V.I., Puerto Rico and Canada booked on or after May 12, 2008. Travelers who booked before this date may check two bags for free.
Who's Exempt: First- or business-class travelers, customers who purchase full-fare economy-class tickets, customers flying to destinations beyond those mentioned above, select AAdvantage and oneworld Alliance members, and military passengers on active duty. Other exemptions apply; see link below for details.
Excess Bags: $100 per piece for third, fourth and fifth checked bags; $200 per piece for any additional bags. Exceptions may apply for international itineraries.
Overweight Bags: $50 for each bag weighing 51 to 70 pounds; $100 for each bag weighing 71 to 100 pounds. Bags over 100 pounds are not permitted.
Oversized Bags: $150 for bags measuring 62 to 115 inches. Larger bags are not permitted.

Continental Airlines
First Checked Bag: $15 each way for economy-class flights within the United States, Puerto Rico, U.S.V.I. and Canada, purchased on or after September 6, 2008. Free for flights booked before this date.
Second Checked Bag: $25 each way for economy-class flights within the United States, Puerto Rico, U.S.V.I. and Canada, purchased on or after April 5, 2008. The $25 fee also applies to economy-class travelers headed to Mexico, the Caribbean, and Central and South America (excluding Brazil) who booked on or after May 8, 2008.
Who's Exempt: EliteAccess customers, OnePass Elite members, customers on full-fare economy tickets, active-duty military personnel, and passengers headed to international destinations besides the ones listed above.
Excess Bags: $100 per excess bag for travel to and from Canada, the Caribbean, the Bahamas, Latin America and the United States. $150 per excess bag for travel to and from other international destinations.
Overweight Bags: $50 per bag weighing 51 to 70 pounds. Heavier bags will not be accepted.
Oversized Bags: For travel to and from Canada, the Caribbean, the Bahamas, Latin America and the United States: $100 per bag that exceeds 62 inches; bags exceeding 115 inches are not permitted. For travel to and from other international destinations: $150 per bag between 62 and 80 inches; $300 per bag between 81 and 115 inches; bags exceeding 115 inches are not permitted.