In September 1970, members of the Popular Front for the Liberation of Palestine (PFLP) hijacked four airliners bound for New York City and one for London. Three aircraft were forced to land at Dawson's Field, a remote desert airstrip near Zarqa, Jordan, formerly Royal Air Force Station Zarqa, which then became PFLP's "Revolutionary Airport". By the end of the incident, one hijacker had been killed and one injury reported. This was the second instance of mass aircraft hijacking, after an escape from communist Czechoslovakia in 1950.

On 6 September, TWA Flight 741 from Frankfurt (a Boeing 707) and Swissair Flight 100 from Zrich (a Douglas DC-8) were forced to land at Dawson's Field. On the same day, the hijacking of El Al Flight 219 from Amsterdam (another 707) was foiled: hijacker Patrick Argello was shot and killed, and his partner Leila Khaled was subdued and handed over to British authorities in London. Two PFLP hijackers, who were prevented from boarding the El Al flight, hijacked instead Pan Am Flight 93, a Boeing 747, diverting the large plane first to Beirut and then to Cairo, rather than to the small Jordanian airstrip. On 9 September, a fifth plane, BOAC Flight 775, a Vickers VC10 coming from Bahrain, was hijacked by a PFLP sympathizer and taken to Dawson's Field in order to pressure the British to free Khaled.

While the majority of the 310 hostages were transferred to Amman and freed on 11 September, the PFLP segregated the flight crews and Jewish passengers, keeping the 56 Jewish hostages in custody, while releasing the non-Jews. Six hostages in particular were kept because they were men and American citizens, not necessarily Jews: Robert Norman Schwartz, a U.S. Defense Department researcher stationed in Thailand; James Lee Woods, Schwartz's assistant and security detail; Gerald Berkowitz, an American-born Jew and college chemistry professor; Rabbi Avraham Harari-Raful and his brother Rabbi Yosef Harari-Raful, two Sephardi Brooklyn school teachers; and John Hollingsworth, a U.S. State Department employee. Schwartz, whose father was Jewish, was a convert to Catholicism. On 12 September, prior to their announced deadline, the PFLP used explosives to destroy the empty planes, as they anticipated a counterstrike.The PFLP's exploitation of Jordanian territory was an example of the increasingly autonomous Arab Palestinian activity within the Kingdom of Jordan a serious challenge to the Hashemite monarchy of King Hussein. Hussein declared martial law on 16 September and from 17 to 27 September his forces deployed into Palestinian-controlled areas in what became known as Black September in Jordan, nearly triggering a regional war involving Syria, Iraq, and Israel.

A swift Jordanian victory, however, enabled a 30 September deal in which the remaining PFLP hostages were released in exchange for Khaled and three PFLP members in a Swiss prison.

The Popular Front for the Liberation of Palestine (Arabic: الجبهة الشعبية لتحرير فلسطين, romanized: al-Jabhah al-Sha`biyyah li-Taḥrīr Filasṭīn, PFLP) is a secular Palestinian Marxist–Leninist and revolutionary socialist organization founded in 1967 by George Habash. It has consistently been the second-largest of the groups forming the Palestine Liberation Organization (the PLO, founded in 1964), the largest being Fatah (founded in 1959).

Ahmad Sa'adat has served as Secretary-General of the PFLP since 2001. He was sentenced in December 2006 to 30 years in an Israeli prison. The PFLP currently considers both the Fatah-led government in the West Bank and the Hamas government in the Gaza Strip illegal because elections to the Palestinian National Authority have not been held since 2006. As of 2015, the PFLP boycotts participation in the PLO Executive Committee and the Palestinian National Council.The PFLP has generally taken a hard line on Palestinian national aspirations, opposing the more moderate stance of Fatah. It does not recognise the State of Israel, it opposes negotiations with the Israeli government, and favours a one-state solution to the Israeli–Palestinian conflict. The military wing of the PFLP is called the Abu Ali Mustapha Brigades. The PFLP is well known for pioneering armed aircraft-hijackings in the late 1960s and early 1970s.

According to PFLP Politburo member

and former aircraft-hijacker Leila Khaled, the PFLP does not see suicide bombing as a form of resistance to occupation or as a strategic action or policy and no longer carries out such attacks. The PFLP has been designated a terrorist organisation by the United States, Japan, Canada, Australia and the European Union.From its foundation the PFLP sought both superpower and regional patrons, early on developing ties with the Soviet Union, the People's Republic of China, North Korea and, at various times, with regional powers such as Syria, South Yemen, Libya and Iraq, as well as with left-wing groups around the world, including the FARC and the Japanese Red Army. When that support diminished or stopped, in the late 1980s and 1990s, the PFLP sought new allies and developed contacts with Islamist groups linked to Iran, despite the PFLP's strong adherence to secularism and anti-clericalism. The relationship between the PFLP and the Islamic Republic of Iran has fluctuated – it strengthened as a result of Hamas moving away from Iran due to differing positions on the Syrian Civil War. Iran rewarded the PFLP for its pro-Assad stance with an increase in financial and military assistance. The PFLP has been accused by Israel of diverting European humanitarian aid from Palestinian NGOs to itself.