• Anacortes Airport (OTS)
  • Bellingham International Airport (BLI)
  • Boeing Field (BFI)
  • Friday Harbor Airport (FRD)
  • Grant County International Airport (MWH)
  • Kenmore Air Harbor (S60)
  • Orcas Island Airport (ESD)
  • Pangborn Memorial Airport (EAT)
  • Pullman-Moscow Regional Airport (PUW)
  • Seattle-Tacoma International Airport (SEA)
  • Spokane International Airport (GEG)
  • Tri-Cities Airport (Washington) (PSC)
  • Walla Walla Regional Airport (ALW)
  • William R. Fairchild International Airport (CLM)
  • Yakima Air Terminal (YKM)