In November 1997, Mesa negotiated a codeshare agreement to provide service to US Airways as US Airways Express for 14 regional jets to various cities from its Philadelphia and Charlotte hubs.
In 1998 and 2000, the agreement was expanded to 28 jets and then to 52 jets.
The first CRJ200 aircraft began operating in 1998.
As Mesa began taking deliveries of the Embraer ERJ 145 aircraft in 2000, the CRJs were transferred to the America West division, separating the fleet types.

In 2003, 20 CRJ200 aircraft were reintroduced to the US Airways Express division.
With the reintroduction of the CRJ, the CRJ200 aircraft operated out of the Philadelphia hub, and the ERJ-145 aircraft operated out of the Charlotte hub.

In 2005, Mesa's codeshare agreement with US Airways was not reaffirmed in bankruptcy court, and Mesa began transitioning the aircraft to other codeshares.
Twenty-six ERJ aircraft were transitioned to Freedom Airlines, and the CRJ and remaining ERJs were transferred to Mesa's United Express operation.
However, following the America West Airlines merger later that year, the Mesa contract for America West Express was retained and expanded to include non-former America West Express routes.
All US Airways Express flying was converted to American Eagle on October 17, 2015, when the merger between American and US Airways was completed.
In November 1997, Mesa negotiated a codeshare agreement to provide service to US Airways as US Airways Express for 14 regional jets to various cities from its Philadelphia and Charlotte hubs. In 1998 and 2000, the agreement was expanded to 28 jets and then to 52 jets. The first CRJ200 aircraft began operating in 1998. As Mesa began taking deliveries of the Embraer ERJ 145 aircraft in 2000, the CRJs were transferred to the America West division, separating the fleet types.
In 2003, 20 CRJ200 aircraft were reintroduced to the US Airways Express division. With the reintroduction of the CRJ, the CRJ200 aircraft operated out of the Philadelphia hub, and the ERJ-145 aircraft operated out of the Charlotte hub.
In 2005, Mesa's codeshare agreement with US Airways was not reaffirmed in bankruptcy court, and Mesa began transitioning the aircraft to other codeshares. Twenty-six ERJ aircraft were transitioned to Freedom Airlines, and the CRJ and remaining ERJs were transferred to Mesa's United Express operation. However, following the America West Airlines merger later that year, the Mesa contract for America West Express was retained and expanded to include non-former America West Express routes. All US Airways Express flying was converted to American Eagle on October 17, 2015, when the merger between American and US Airways was completed.
Mesa Airlines