Here's the story from http://www.worldair.com/history.html
"The early 1970s were a very profitable time for World. The military airlift to Vietnam was the airline's main business. While World continued to operate its contract flights in support of Vietnam, airline president Daly was troubled by the human suffering of the Vietnamese people. Between Feb. 15 and 26, 1975, World flew supply flights from Tan San Nhut air base in Vietnam to the beleaguered Cambodian capital of Phnom Phen with two DC-8s - averaging six round trips a day.
The relief flights were a test of both the aircraft's and its crew's mettle. Because of rocket attacks around the airport, the DC-8s would descend at 4,500 feet per minute to the war torn airfield. By March 29, 1975, the North Vietnamese were closing on South Vietnam's second biggest city of Da Nang. Daly brought two 727s to Saigon to make 20 evacuation flights from Da Nang under government charter. After only three flights had been made, the US Embassy canceled the contract due to the deteriorating situation.
Daly, the humanitarian, ignored official advice and, on March 29, 1975, flew the two 727s to Da Nang in hopes of rescuing women and children. When the first plane landed, with Daly aboard, thousands of people rushed the plane and clambered aboard anywhere they could. Daly stood at the ventral airstairs using his Golden Glove hands and the butt of a pistol to knock off the soldiers trying to climb aboard the already overloaded plane. With the runway full of people racing toward the airplane, the flight's captain, Ken Healy, took off from a parallel taxiway of about 5,000 feet in length. Despite being hit by a grenade, several bullet holes, and striking a pole on take-off, the aircraft made the usual 40 minute flight in just over two hours. When the aircraft landed at Saigon the crew figured out that they had carried somewhere between 330 and 338 "passengers" - including about 60 in the cargo compartments and eight in the landing gear wells.
Despite the success of the "Last Flight From Da Nang" and the worldwide media exposure, Daly was depressed that of the hundreds of souls aboard, only eleven women and children were among them. "