SkyWest

Frustrated by the limited extent of existing air service, Ralph Atkin, a St. George, Utah, lawyer, purchased Dixie Airlines on April 26, 1972, to shuttle businessmen to Salt Lake City. After early struggles, SkyWest began a steady expansion across the western U.S. It became the eleventh largest regional carrier in 1984 when it acquired Sun Aire Lines of Palm Springs, California, and had its initial public offering in 1986.In early 1986, SkyWest began codesharing as Western Express, a feeder service for Western Airlines at its Salt Lake City hub and other mainline Western destinations utilizing Embraer EMB 120 and Fairchild Swearingen Metroliner turboprop aircraft. Following the acquisition and merger of Western by Delta Air Lines in 1987, SkyWest then became a Delta Connection air carrier with code share service being flown on behalf of Delta to destinations in Arizona, California, Colorado, Montana, Nevada, Utah and Wyoming.From 1995 through 1997, SkyWest operated codeshare service for Continental Airlines as Continental Connection on flights out of Los Angeles that were also operated as Delta Connection.

In 1997 SkyWest began operating as United Express in addition to Delta Connection on flights out of United Airlines hubs at SFO, LAX and DEN. SkyWest became United's largest United Express operation by the late 1990s. Flights were initially operated with Embraer EMB 120s and Bombardier CRJ200 regional jets. CRJ700s were added in the early 2000s and the Embraer 175 were added in 2014.

A partnership with Continental was revived in 2003 as Continental Connection out of George Bush Intercontinental Airport in Houston, but was discontinued in June 2005. This operation used Embraer EMB 120s.

On August 15, 2005, Delta sold Atlantic Southeast Airlines to the newly incorporated SkyWest, Inc., for $425 million in cash. The acquisition was completed on September 8, 2005.In 2007 SkyWest began code sharing with Midwest Airlines at the carriers hubs in Milwaukee and Kansas City using Bombardier CRJ200 regional jets. In 2010 the code share with Midwest had ended and a new code share agreement began with AirTran Airways at Milwaukee. On September 6, 2011, AirTran Airways ended its codesharing and partnership with SkyWest. Shortly after, SkyWest began a codesharing agreement with US Airways to operate CRJ200 aircraft from US Airways' hub in Phoenix, Arizona.On August 4, 2010, SkyWest, Inc., announced that it planned to acquire ExpressJet and merge it with SkyWest subsidiary Atlantic Southeast Airlines in a deal reported to have a value of $133 million. The purchase aligned the largest commuter operations of United Airlines and Continental Airlines, who were in a merger process, and was approved on September 13, 2010, by the Federal Trade Commission.In May 2011, SkyWest replaced Horizon Air on six routes on the West Coast being operated for Alaska Airlines. The flights were based out of Seattle and Portland, and fly to several California cities including Fresno, Burbank, Santa Barbara and Ontario. Horizon Air had been operating these routes with Bombardier CRJ700 aircraft however Horizon retired this aircraft from its fleet. Alaska Airlines had a similar agreement with PenAir for Alaskan flights and Horizon Air for flights in the lower 48.On November 15, 2012, SkyWest began a capacity purchase agreement with American Airlines for 12 Bombardier CRJ200 aircraft operating as American Eagle from American's hub in Los Angeles, California. This code share agreement with American was greatly expanded over the next several years to include destinations from American's hubs at Chicago, Dallas/Fort Worth, and Phoenix. Larger CRJ700/900 aircraft were introduced to the American Eagle system in 2016 and the smaller CRJ200s were discontinued in 2020. Embraer 175 aircraft joined the American Eagle system in late 2021.

On September 6, 2017, SkyWest Airlines reported that it has entered into aircraft purchase agreements and capacity purchase agreements to acquire and fly 15 new aircraft with Delta Air Lines and 10 new aircraft with Alaska Airlines. Of the 25 aircraft, 15 Embraer 175SC aircraft will fly under an agreement with Delta in a 70-seat configuration. The E175SC aircraft is built on the same airframe as other E175 aircraft and can be retrofitted to 76 seats in the future. The agreement with Alaska includes 10 Embraer 175 aircraft which will be configured with 76 seats, similar to aircraft SkyWest has previously placed into service with Alaska. Expected delivery dates of the 25 aircraft run from March 2018 through the end of 2018.On December 18, 2018, SkyWest, Inc., announced that it would sell ExpressJet Airlines to another airline holding company with ties to United Airlines, ExpressJet's sole client. The $70 million sale closed on January 23, 2019.