The film opens up on Operation Eagle Claw, the American operation to rescue American hostages being held at the U.S. embassy to Tehran. The operation is being aborted after a fatal helicopter crash, with the U.S. Delta Force evacuating to their C-130 transports. Among them is Major Scott McCoy (Chuck Norris), who, against orders, rescues his wounded comrade Pete Peterson (William Wallace) from the burning helicopter before the team finally evacuates. McCoy expresses his disgust for the politicians and military hierarchy that forced the mission to launch despite the risks, and announces he is resigning his commission.Five years later, a group of Lebanese terrorists armed with a Colt M1911, PM-63 machine pistol and AK-47s hijack American Travelways Boeing 707 (ATW) Flight 282 that is on a flight from Cairo, Egypt to Athens, Greece to Rome, Italy and then to New York City.Taking all passengers and crew hostage, the group, the pro-Khomeini New World Revolutionary Organization, led by Abdul Rifi (Robert Forster) and Mustafa (David Menachem), forces Captain Roger Campbell (Bo Svenson) and his crew to fly the plane to Beirut, Lebanon, where they make demands to the United States government that, if not met, will result in the death of the hostages.During the crisis, they separate the Israeli passengers from the Americans by forcing the flight attendant to identify them, who hesitates to do so because she is German. When the plane lands in Algiers for refueling, the terrorists bring a dozen additional henchmen on board and surrender the female hostages and children. Meanwhile Delta Force, led by Colonel Nick Alexander (Lee Marvin) and McCoy, are deployed to resolve the crisis. Once the female hostages are evacuated, they launch their assault, only to discover too late that there are additional hijackers and inadvertently alert the terrorists. Abdul kills one hostage, a US Navy diver named Tom, taking the other two US divers with them as well as dozens of male Jewish passengers on board to Beirut. Delta Force gives chase to rescue the remaining hostages.Upon landing in Beirut, the terrorists gather their hostages and transport them to a militant-controlled area of Beirut. Using a sympathetic Greek Orthodox priest, Israeli Army Intelligence prepares an operation to free the hostages. In a prolonged campaign against the terrorists, Delta Force bides their time to identify the terrorist leaders and the location of the hostages.Once their location is discovered, Delta Force assaults the terrorist holdout, freeing the hostages and evacuating them to the airport. During the battle, McCoy, Peterson, and their team hunts down Abdul and his men, killing most of the militants before Abdul shoots Peterson, gravely injuring him. McCoy chases Abdul and tracks him down to an abandoned home. He then engages him into a vicious hand-to-hand fight, breaking Abdul's arm. As the terrorist leader prepares to shoot McCoy, he is killed after McCoy launches a rocket into his car.With the hostages and rescue teams secured, the team seizes Flight 282 by secretly infiltrating the airfield through a cotton field. Using silenced weapons, Alexander and the Delta team assassinates the terrorist guards including the last hijacker and saves the crew, ordering them to fly to Israel. The team boards the plane with all of the hostages, taking off just as McCoy is the last one to board the plane after having destroyed several terrorist jeeps on the runway with his motorcycle armament. On board the team tends to the wounded passengers and Pete who is now dying.After having confirmed that the hostages are safe and on route home, Pete says his farewells to McCoy before succumbing to his wounds. In the main cabin the ex-hostages and Delta commandos join together in a rousing rendition of "America the Beautiful", not knowing about Pete's death. In Israel, the plane lands safely and the hostages are greeted by their families, while Delta Force disembarks with Pete's body in tow. The team concludes their operation and departs for the United States in the middle of celebrations by the people.