Northwest is flying its first Boeing 757-200 retrofitted with blended winglets in revenue service. The aircraft (N536US) is operating primarily from the airline's hubs to long-haul mainland U.S.

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Last year, as jet fuel prices climbed to $1.75 a gallon, AMR Corp.'s board of directors approved a fuel-conserving wing reconstruction program for 20 of American Airlines' Boeing 757s. The work, which ...