United Airlines just gave fliers one more reason to travel light.

The world's second-largest carrier Monday created a $25 charge for most economy travelers to check a second bag on domestic flights.

No other airlines have followed suit -- yet -- but analysts expect they will. Typically when one carrier tries revenue-boosting programs, others follow. Northwest Airlines declined to comment on whether it was considering such a move.

Analysts don't expect much backlash from fliers -- with $4 snack packs, disappearing pillows and pricey exit-row seats now the norm.

"It's moving to a more pay-for-whatever-you-want, a truly a la carte system," travel expert Terry Trippler said.

"I think we're all getting used to it," Trippler said. With travelers resisting fare increases, airlines look to new fees to cover rising costs -- fuel being the biggest. United's fuel costs went up 25 percent last quarter alone, to $1.4 billion, spokeswoman Robin Urbanski said.

The charge applies to nonrefundable economy tickets for U.S., Canadian and certain Caribbean travel starting May 5 and "only applies to tickets purchased on or after February 4," United said. Checking a second bag to other international destinations will stay free. Travelers with certain Mileage Plus or Star Alliance status are exempt. So are strollers and children's car seats.

Only one in four passengers checks two bags, Urbanski said, but United estimated the change will bring $100 million a year in new revenue and cost savings.

The silver lining for travelers could be fewer checked bags, leading to better and faster handling, Trippler said. On the other hand, airlines likely will be on guard against passengers crowding the cabin with oversized carry-ons to save the fee for a second suitcase.

H.J. Cummins • 612-673-4671