The best replacement for northwest is delta.

The best alternatives to northwest are rated as following:
★★★★★  delta
★★★★★  alienware
★★★★★  northeast
★★★★  north west
★★★★  northwest
★★★★  pitt state
★★★  southwest
★★★  ginsberg
★★★  missouri western
★★  suitland
★★  united
★★  quince orchard
★  delta airlines
★  ucm
★  airlines
★  paint branch
★  dalton
★  seneca valley
★  duluth
★  digital storm
  maingear
  southwest airlines
  new england
  pitt state football
  origin
  gaithersburg
  sager
  loveland
  qo
  dover
  velocity micro
  pittsburg state
  southeast
  olathe north

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Speaking about northwest, one probably shouldn't forget about delta.

Other search terms related to northwest and their ratings are:
★★★★★ delta
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Google Trends

Scale is based on the average worldwide traffic of northwest in all years. Click on graph for more.
northwest
delta
alienware