Operational Airlines

Compass Airlines, LLC, is a regional airline headquartered in Delta Air Lines Building C at Minneapolis−Saint Paul International Airport in Fort Snelling, Hennepin County, Minnesota;prior to December 16, 2009, it was headquartered in unincorporated Fairfax County, Virginia, United States, east of the Chantilly CDP. The airline launched inaugural service with a single Bombardier CRJ200LR aircraft under the Northwest Airlink (now Delta Connection) brand between Minneapolis/St. Paul and Washington, D.C. on May 2, 2007. On August 21, 2007, it began flying two Embraer 175 76-passenger aircraft, and expanded to 36 aircraft by December 2008.

Envoy Air Inc. (formerly American Eagle Airlines) is an air carrier headquartered in Irving, Texas, in the Dallas-Fort Worth metroplex. It is a wholly owned subsidiary of American Airlines Group that, along with several carriers outside the group, feeds the American Airlines route network under the American Eagle brand. With over 1000 flights a day, serving 150 cities across the United States, Canada, Mexico and the Caribbean, Envoy is considered to be one of the world's largest regional airline systems. Envoy is an affiliate member of the Oneworld airline alliance.

Mesa Airlines, Inc. is an American regional airline based in Phoenix, Arizona. It is an FAA Part 121-certificated air carrier operating under air carrier certificate number MASA036A issued on June 29, 1979. It is a subsidiary of Mesa Air Group and operates flights as American Eagle and United Express via respective code sharing agreements with American Airlines and United Airlines. It serves more than 180 markets in the Western Hemisphere. In a 1997 article from the Journal of Air Transportation, Mesa's safety record was noted as having the fewest incidents among domestic regional airlines At that time.

Piedmont Airlines, Inc. /ˈpiːdmɒnt/ is an American regional airline operating for American Eagle, formerly US Airways Express. It is a wholly owned subsidiary of the American Airlines Group, headquartered in unincorporated Wicomico County, Maryland, near the city of Salisbury. It conducts flight operations using Embraer ERJ 145 aircraft. Piedmont Airlines, Inc. also provides ground handling and customer service for airports in the Northeastern & Western parts of the United States. Its main base is Philadelphia International Airport with an additional hub at Charlotte Douglas International Airport.

PSA Airlines is an American regional airline headquartered at Dayton International Airport in Vandalia, Ohio,[3] that flies under the American Eagle brand for American Airlines. PSA is a wholly owned subsidiary of American Airlines Group. PSA Airlines operates an all-jet fleet consisting of exclusively Bombardier regional jet aircraft. The company has a team of more than 5,000 employees, operating more than 800 daily flights to nearly 70 destinations on behalf of American Airlines. Headquartered in Dayton, Ohio, PSA also has flight crew bases located in Cincinnati, Ohio; Knoxville, Tennessee; Washington, DC; Charlotte, North Carolina; Philadelphia, Pennsylvania; and Norfolk, Virginia. PSA has airport maintenance facilities in Akron-Canton (CAK), Charlotte-Douglas International (CLT), Cincinnati/Northern Kentucky International (CVG), Greenville-Spartanburg (GSP), Norfolk International (ORF), Savannah/Hilton Head International (SAV), Pensacola International (PNS), and Dayton International (DAY). PSA operates 33 Bombardier CRJ200 aircraft, 45 Bombardier CRJ700 aircraft and 62 Bombardier CRJ900 aircraft.

Republic Airways Inc., operating as Republic Airways, is a regional airline subsidiary of Republic Airways Holdings that operates service as American Eagle, Delta Connection, and United Express using a fleet of Embraer 170 and Embraer 175 regional jets. It is headquartered in Indianapolis, Indiana. Its call sign "Brickyard" is derived from the nickname of the Indianapolis Motor Speedway.

SkyWest Airlines is a North American regional airline headquartered in St. George, Utah. SkyWest is classified as one of the major airlines of the United States. However, it is a regional airline and primarily serves major air carriers via contracts with American Airlines (as American Eagle), Delta Air Lines (as Delta Connection), Alaska Airlines (as Alaska SkyWest) and United Airlines (as United Express). SkyWest is primarily paid to operate and maintain aircraft used on flights that are scheduled, marketed, and priced by a partner mainline airline. In all, it is the largest regional airline in North America when measured by fleet size, number of passengers carried, and number of destinations served between all the airlines it contracts with. SkyWest operates an average of more than 2,200 flights per day to 250+ cities in the United States, Canada, Mexico, and the Bahamas with an extensive network of routes largely set up to connect passengers between smaller airports and the large hubs of its partner airlines. In total, SkyWest carried 35.9 million passengers in 2017.