America West Airlines was a U.S. airline headquartered in Tempe, Arizona. Their main hub was at Sky Harbor Airport in Phoenix, Arizona, with a secondary hub at Las Vegas McCarran International Airport in Las Vegas, Nevada. The airline became part of the US Airways Group after it acquired the larger airline in 2005 and adopted the US Airways brand name. America West was the second largest low-cost carrier in the U.S. after Southwest Airlines and served approximately 100 destinations in the US, Canada, and Mexico. Service to Europe was provided through codeshare partners. In March 2005, the airline operated a of 140 aircraft, with a single maintenance base at Sky Harbor Airport in Phoenix.