FAA is now allowing three parallel “optimized profile descents” into the Washington DC-area’s three major airports, an airspace modification the agency said will save airlines 2.5 million gallons of fuel per year. Aircraft flying to Washington Dulles (IAD), Washington National (DCA) and Baltimore/Washington (BWI) airports from the northwest are being allowed “to descend from cruising altitude to the runway in a smooth, continuous arc instead of the traditional ...

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