Starting today, May 5th, non-exempt travelers flying on Continental, Delta, Northwest, United and US Airways must pay $25 to check a second piece of luggage. American Airlines will begin charging that same $25 on May 12. Air Tran jumps in with a $10 second-bag fee on May 15^th. And, just in time for summer travel, passengers on Alaska Airlines and Horizon Air will start paying that $25 fee on July 1^st.

One bit of good news: As of today, United Airlines will waive that second bag fee for passengers who pay to check luggage at remote baggage check-in sites such as hotel lobbies, convention centers and cruise ships.

No word yet on how long the airline will be doing that, but so far it is the only airline to do so.

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