American Airlines economy fliers to pay $25 for 2nd bag American Airlines on Monday became the latest carrier to announce that it would require passengers to pack lightly or pay up. The biggest U.S. airline said it must charge passengers $25 for checking a second bag to help offset fuel costs. The fee will apply to travelers who buy domestic economy-class tickets on or after May 12, American said. It also will affect...April 25: Dominican AA Manager gets it wrong! April 22: Save money! Send bags UPS?