Mesa Airlines: From American Eagle to United Express Mesa Airlines, founded in 1980 in Farmington, New Mexico, has evolved from a small regional carrier into a significant player in North American aviation. Initially operating as Mesa Air Shuttle, the airline expanded its reach and capabilities over the decades. Transition from American Eagle to United Express In 2014, Mesa began operating under the American Eagle brand, providing regional services for American Airlines. However, in December 2022, American Airlines announced the end of its partnership with Mesa, citing financial and operational challenges, including pilot shortages and wage disparities between Mesa and American's wholly owned regional carriers. Consequently, Mesa ceased American Eagle operations on April 3, 2023 . Following this, Mesa entered into a new five-year agreement with United Airlines to operate regional flights under the United Express brand. This partnership began in March 2023, marking a significant shift in Mesa's operational focus . Fleet Modernization and Operational Changes Mesa's fleet has undergone significant changes in recent years. In early 2025, the airline completed a transition to an all-Embraer E175 fleet, retiring its Bombardier CRJ-900 aircraft. This move was driven by United Airlines' seat-scope limitations and Mesa's financial restructuring efforts . Additionally, Mesa has been actively involved in sustainable aviation initiatives. The airline has partnered with United Airlines and electric aircraft companies like Archer Aviation and Heart Aerospace to invest in electric vertical takeoff and landing (eVTOL) aircraft and electric regional aircraft, aiming to reduce the carbon footprint of regional air travel . Merger with Republic Airways In April 2025, Mesa Air Group announced an all-stock merger with Republic Airways, a regional airline operating under the brands of American Eagle, Delta Connection, and United Express. The merger, expected to close in late 2025, will create a combined fleet of approximately 310 Embraer 170/175 aircraft and over 1,250 daily departures. The new entity will operate under the name Republic Airways Holdings Inc. and continue to serve its major airline partners . Looking Ahead Mesa Airlines' transition from American Eagle to United Express, coupled with its fleet modernization and commitment to sustainable aviation, positions the airline for continued growth and innovation in the regional aviation sector. The upcoming merger with Republic Airways further strengthens its operational capabilities and market presence, ensuring a robust future in the evolving landscape of regional air travel.