“When a passenger flies with a pet and is a member of our frequent flyer program, they earn double True Blue points,” Eshelman sais. “So essentially, their pets are helping them earn free trips faster by boosting their number of miles in their account.”

Continental Airlines has a similar trade-off for pets and their people with their OnePass Frequent Flyer Program. Pets that travel “Cargo Class” with the airline’s PetPass Program also help to booster their owner’s mileage account toward free award trips by earning an additional OnePass mile for every dollar spent on pet travel (including tax, fuel and security surcharges).

Complete article here:

http://www.msnbc.msn.com/id/25333275/

UA had a similar program in place for about 3 months in 2006... and never again. I very much wish they'd bring it back. With a ridiculously-high $125 one-way fee, the least they could do is offer some miles...

I am waiting for DL to announce such a bonus. :(