Tightening the in-trail spacing between each aircraft in a gaggle of linear arrivals by just 6 sec. can mean 11 more landings per hour at an airport. This can translate into an economic boon for communities, paired with a green payback of less fuel burned and less noise made on the way in. That is the gist of a month-long Flight Deck Interval Management (FIM) flight-test program that NASA and partners are in the midst of completing in the airspace east of the Seattle-Tacoma International ...

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