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.

In July 2010, the airline was purchased from Delta Air Lines and became a wholly owned subsidiary of Trans States Holdings.

Compass Airlines was formed as a result of a contract dispute between Northwest Airlines and its pilots' union, the Air Line Pilots Association (ALPA). The Northwest Airlines pilot group was asked to give relief on a section of their collective bargaining agreement governing "scope", which protects pilot jobs by ensuring that an airline's customers are flown by the employees of that airline. The pilots eventually agreed to a concession on the scope of their contract allowing a limited number of 76-seat aircraft to be flown by outsourced pilots working for a subcontractor regional airline. In exchange for their concession the Northwest Airlines pilots demanded in return that the pilots of these new aircraft would eventually "flow-up" into mainline pilot jobs at Northwest Airlines, and that Northwest Airlines pilots would retain the ability to "flow-down" into the newly subcontracted pilot jobs in the event that Northwest Airlines were to furlough the mainline pilots.

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