HP meaning in Transport & Travel ?

America West Airlines was a United States major airline, founded in 1981, with service commencing in 1983, and having reached US$1 billion in annual revenue in 1989, headquartered in Tempe, Arizona. At the time of its acquisition of US Airways, America West had the unique distinction of being the only post-deregulation U.S. airline still operating under its original operating certificate. Their main hub was at Phoenix Sky Harbor International Airport, with a secondary hub at McCarran International Airport in Las Vegas. The airline acquired US Airways in 2005 but took on the name of US Airways. America West served about 100 cities in the US, Canada, and Mexico; flights to Europe were on codeshare partners. In September 2005, the airline had 140 aircraft, with a single maintenance base at Phoenix Sky Harbor Airport. Regional jet and turboprop flights were operated on a code sharing basis by Mesa Airlines and Chautauqua Airlines as America West Express.

Beginning in January 2006, all America West flights were branded as US Airways, along with most signage at airports and other printed material, though many flights were described as "operated by America West." Apart from two heritage aircraft, the only remaining America West branding on aircraft were found on some seat covers and bulkheads. The merged airline used America West's "CACTUS" callsign and ICAO code "AWE", but retained the US Airways name. As part of a merger between American Airlines and US Airways in February 2013, which led to American becoming the world's largest airline, the call sign and ICAO code name was later retired on April 8, 2015 when the FAA granted a single operating certificate for both US Airways and American Airlines. The US Airways brand continued until October 17, 2015, when American Airlines retired the name.