The more efficient engines are headed to the booming Northeast Corridor line, whose growing ridership is also paying for them.
The carrier will also repurchase shares as part of a plan to return $1 billion to shareholders.
Frontier Airlines joins the trend and also adds a $2 charge for coffee or soda.
Consultant John Thomas' idea is credited with saving the airlines, but he flies on a private plane.
The carrier's new 'seat-to-seat delivery' lets passengers buy each other drinks and snacks.
US markets are set for a higher open on news of yen weakness as earnings season continues full steam ahead.
Air traffic controllers will see furlough days as the FAA absorbs $637 million in budget cuts.
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