- Royal Phnom Penh Airways was a Cambodian airline that operated from 2004 to 2008. It was based in Phnom Penh, the capital city of Cambodia. The airline operated domestic and international flights to destinations such as Siem Reap, Sihanoukville, Bangkok, and Ho Chi Minh City. Royal Phnom Penh Airways had a small fleet of aircraft, including Boeing 737 and Airbus A320 planes. However, the airline faced financial difficulties and ceased operations in 2008.