Is there a difference (i.e. from all other airlines, and regardless of type or aircraft) in takeoff and departure procedures for Northwest flights departing northbound at Reagan National takeoffs? Why and why would FAA approve such a difference in application of noise abatement procedures?
Two aspects: (1) NW pilots use more runway, or at least rotate closer to the end of the runway, and (2) NW left turnout departures going north up the Potomac use a much more gradual slope than that employed by all other pilots and airlines.
When I lived just up the river from DCA in Rosslyn in the late '60s and early '70s, I could always tell a NW departure, then typically a 727. They simply came over Rosslyn much lower than anyone else.
Just today, watching takeoffs at the north end of the main DCA runway, any NW flight lifted off much closer to the end of the runway than flights for all other airlines. And, they followed a slope perceptibly less steep than that for planes of any other airline. [a 319 to DTW and a 320 to MSP]
Anyone confirm this? If so, why is NW so different?