| name | Hub | image | date Ceased operations | date Commenced operations | IATA Code | ICAO Code | city Headquarters | administrative division Headquarters | country Headquarters | continent Headquarters | Country | continent | Parent | number of aircrafts | number of destinations | Website |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alaska Airlines | Los Angeles International Airport |  | 06/06/1944 | AS | ASA | Seattle | Washington | United States | Americas | United States | Americas | Alaska Air Group | 156 | 95 | Website | |
| Cargo 360 | Seattle–Tacoma International Airport |  | 2008 | 2005 | GG | GGC | Seattle | Washington | United States | Americas | 3 | 5 | Website | |||
| Cascade Airways | 1986 | 09/06/1969 | CZ | CCD | Spokane, Washington | Washington | United States | Americas | 14 | Website | ||||||
| Harbor Airlines | 2001 | 1971 | HB | HAR | Oak Harbor, Washington | Washington | United States | Americas | United States | Americas | Website | |||||
| Horizon Air | Portland International Airport |  | 01/09/1981 | QX | QXE | SeaTac, Washington | Washington | United States | Americas | United States | Americas | Alaska Air Group | 55 | 42 | Website |