Thừa Thiên–Huế Province

Shortly after takeoff from Qui Nhơn Airport for Đà Nẵng, a hijacker ordered the crew to divert to Đồng Hới. The captain stated that a fuel stop was necessary at Đông Hà Airport but he flew directly to Huê. When the hijacker realized he was tricked, he detonated explosives in the front part of the cabin. Three passengers were killed while several other occupants were injured. The aircraft was damaged beyond repair.

The airplane departed Ubon Ratchathani Air Base in Thailand on a night armed reconnaissance mission to attack elite NVA forces known to be infiltrating from Laos into South Vietnam along the Ho Chi Minh Trail. While making a second low pass over the target area, the airplane's n°3 engine was hit by a Strela SA-7 missile. The airplane went out of control and crashed in flames in the A Shau Valley. 12 crew members were killed while three others were rescued.
Crew:
Cpt Paul Faris Gilbert, †
Cpt Robert Allan Wilson, †
Cpt Gordon Bocher,
Maj Gerald Francis Ayres, †
Maj Robert Herman Harrison, †
Cpt Mark Giles Danielson, †
2nd Lt Robert Reid,
M/Sgt Jacob Edward Mercer, †
T/Sgt Richard Milton Cole, †
S/Sgt Donald Herman Klinke, †
S/Sgt Larry Jerome Newman, †
S/Sgt Richard E. Nyhof, †
S/Sgt Leon Andrew Hunt, †
S/Sgt Stanley Lawrence Lehrke, †
S/Sgt William P. Patterson.

The electronic warfare airplane was engaged in a radio research mission out from Huế-Phu Bai Airport. En route, it was shot down by a surface-to-air missile and crashed near the demilitarized zone (DMZ). All five occupants were killed.
Crew:
Cpt Michael W. Marker, pilot,
Wo1 Harold L. Algaard, copilot.
Passengers:
Sp5 Rodney D. Osborne,
Sp5 Richard J. Hentz,
Sp6 John T. Strawn.

While in a mission in the A Shau Valley at an altitude of 5,500 feet, the aircraft was hit by enemy fire. An engine was losing oil and the crew decided to return to Huế Airport. Unable to maintain the minimum prescribed altitude, the captain elected to make an emergency landing when the airplane crashed 32 km southwest of Huế. The captain and the flight engineer were killed while seven other occupants were injured.
Those killed were:
1st Lt George M. Wall,
S/Sgt Michael R. Conner.

At 12:05 on 18 May 1969 the Marine Corps KC-130F tanker departed Da Nang Air Base on a routine operational tanker mission. The aircraft continued to the Hue Phu Bai Area for the in-flight refueling mission. The tanker had departed its assigned track by and was proceeding toward the ocean before turning southeast to Da Nang. The KC-130F proceeded southbound for the Hue Phu Bai airfield area while refueling two US Marine Corps McDonnell F-4B Phantom fighter aircraft (152270 and 151450). All three aircraft were descending in a "tobogganing" maneuver while heading southbound in the vicinity of the South Vietnam Coastline. At the same time a separate USMC F-4B Phantom (151001) was heading in a generally westbound direction toward the Hue Phu Bai military area. The two aircraft approached each other nearly head on with a closing rate of approximately 700 knots true airspeed. The initial impact by the F-4B was in the vicinity of the number four engine and the starboard refueling pod on the KC-130F. The radome on the F-4B cleared the propeller on the number four engine as the cockpit initially impacted with it. The single F-4B crashed and the pilot and RIO died instantly. The KC-130F crashed into the sea. One of the refueling F-4B's was severely damaged from the initial crash debris. Phantom 151450 plugged into the starboard drogue, was sprayed with fuel and apparently ingested an undetermined amount of debris into both engines. The F-4B aircraft flipped uncontrollably to an inverted position while the drogue and a portion of the hose remained attached to the aircraft. Its engines could not sustain power and the fighter crashed at sea. Both crew members successfully ejected and were recovered. The second refueling F-4B fighter, 152270 was plugged into the port refueling drogue and sustained limited damage in the form of two small holes in the port aileron and a 1/2 inch hole in the starboard wingtip. The pilot observed the spinning tanker, and when it was apparent he could render no further assistance returned to Chu Lai Air Base without further incident.
Crew:
Maj Jimmie Dwayne Sells,
Maj John Clarence Williamson,
MGSgt Carroll Franklin Hersey,
M/Sgt Edmond Chester Polenski,
Sgt Robert Allen Bonebright,
Cpl James Allen Cox.
Source: The Marine Air Transporter

While descending to Huế-Phú Bài Airport, the crew encountered poor weather conditions with limited visibility. Too low, the twin engine airplane struck the slope of Mt Loc Thuy located about 45 km southeast of Huế Airport. All five occupants were killed.
Crew:
Cpt Charles R. Barnes, pilot,
Cpt David R. Smith, pilot.
Passengers:
SP4 Michael L. Batt,
SP4 Raymond E. Bobe,
Maj Marvin L. Foster.

While cruising in poor weather conditions, the airplane struck trees and crashed on the slope of a wooded mountain. The wreckage was found few hours later and all 12 occupants were killed.

Shortly after takeoff from Camp Evans AFB, while climbing to an altitude of 335 meters, the Caribou collided with a USAF Boeing-Vertol CH-47A Chinook registered 66-19041 that was approaching the same airbase with 6 passengers and five crew members on board. The rear rotor of the Chinook struck the cockpit of the Caribou. Following the collision, the Chinook and the Caribou dove into the ground and crashed few hundred yards from the runway end. All 26 occupants were killed in the accident and up to date, this was considered as the worst aerial collision involving USAF in Vietnam. At the time of the accident, the Caribou speed was about 190 km/h while the Chinook was approaching Camp Evans at a speed of 185 km/h.
Caribou crew:
Cpt Wayne Philip Bundy,
1st Lt Ralph Schiavone,
S/Sgt Donald Gene Cleaver,
S/Sgt James Kenneth Connor.

Several C-130 Hercules transport planes were used to fly supply runs to an airstrip at A Loui. The aircraft approached under low clouds, airdropping the supplies from the rear ramp. Several aircraft were hit by enemy ground fire. The 21st supply aircraft was hit by .50 calibre and 37 mm ground fire. A fire erupted in the cargo hold and the crew attempted to jettison the burning load while the pilot attempted a forced landing on the airstrip. The airplane struck trees, crashed and burst into flames. All eight occupants were killed, among them two photographs.

The crew was approaching Huế-Phú Bài Airport by night and rainy weather. For unknown reason, the aircraft crashed on landing and came to rest in flames. While all five crew members were injured, all six passengers were killed.