Royal Jordanian Airlines (formerly known as Alia Royal Jordanian Airlines) is the flag carrier of Jordan with its head office in the capital, Amman. The airline operates scheduled international services over four continents from its main base at Queen Alia International Airport, with over 500 flights per week and at least 110 daily departures. It joined the Oneworld airline alliance in 2007.

The airline was established on 9 December 1963 and started operations on 15 December 1963 after a royal decree by the late King Hussein. It was named Alia (or Aalya) after King Hussein's eldest child, Princess Alia bint Al Hussein of Jordan (born on 13 February 1956). It is a common misconception that the airline was named after the King's third wife, Queen Alia, whom King Hussein did not marry until 1972. The airline was founded with capital from private shareholders but the Jordanian government later took over the company.

Alia (the Royal Jordanian Airline) started operations with two Handley Page Dart Heralds and a Douglas DC-7 aircraft, serving Kuwait City, Beirut and Cairo from Amman. In 1964, another DC-7 was added and service began to Jeddah. In 1965, Alia initiated service to Rome, its first destination in Europe. The progress made by the airline was threatened by an Israeli air raid during the 1967 Six-Day War when the DC-7 aircraft were destroyed. They were replaced by two Fokker F27s.

In 1968, the airline joined the jet age when it introduced the Sud Aviation Caravelle, and expanded the route network to Nicosia, Benghazi, Dhahran and Doha. 1969 saw the addition of service to Munich, Istanbul and Tehran.

In 1970, Alia phased out the F27s and ordered Boeing 707a. Frankfurt and Abu Dhabi were added to the network. The 707s were delivered in 1971. In that year, service was initiated to Madrid, Copenhagen and Karachi. During the rest of the decade, Boeing 720s, Boeing 727s and Boeing 747s were added to the fleet. A catering department was established, and duty-free shops were opened at Amman airport. Services were added to destinations including Bahrain, Dubai, Muscat, Rabat, Geneva, Amsterdam, Baghdad, Bangkok, Vienna, Damascus, New York City, Houston, and Ras al-Khaimah. In 1979, Alia became a founding member of the Arab Airlines Technical Consortium.

In the 1980s, Tunis and Tripoli joined the route map, and Alia's IBM computer center was inaugurated. Lockheed L-1011 Tristars, Airbus A310s and Airbus A320s joined the fleet. In December 1986, Alia changed its name to Royal Jordanian Airlines, when Princess Alia was nearing her divorce. The airline's first woman pilot flew one of their aircraft during this decade. Service was added to Belgrade, Chicago, Los Angeles, Miami, Bucharest, Singapore, Riyadh, Kuala Lumpur – in cooperation with MAS, Sana'a, Moscow. Montreal, Delhi, Calcutta and Ankara. This decade also saw the introduction of the Gabriel Automated Ticket System – (GATS).

The 1990s saw further expansion. Royal Jordanian and nine other Arab air carriers signed up for the Galileo CRS. The IMCS maintenance and engineering system was added, a new Amman city air terminal was opened at the 7th Circle of the Jordanian capital, and services to Rafah started, since then halted. The cities of Toronto, Colombo, Jakarta, Berlin, Mumbai, Milan and Tel Aviv were added to the network. In November 1997, Royal Jordanian became a code-sharing partner with the US carrier Trans World Airlines and moved operations into the TWA Flight Center (Terminal 5) at the John F. Kennedy International Airport in New York.

In 2000, the U.S. Federal Aviation Administration (FAA) renewed the airline's maintenance and engineering department's license. The duty-free shop was among the services to be privatised. A holding company, RJI, wholly owned by the government, was incorporated as a public limited company in February 2001 to hold all the airlines and associated investments. The airline's name was changed on 5 February 2001 to Alia – The Royal Jordanian Airlines Company, although travellers still use the popular name of Royal Jordanian.