Military

The aircraft was on its way from RAF Tarrant Rushton to the Azores Islands with a crew of 7 and 14 passengers on board. While overflying Cornwall, the airplane went out of control, dove into the ground and crashed in a prairie. All 21 occupants were killed.
Crew (644th Squadron):
F/Sgt Clifford William Akers,
F/O Peter Stafford Briggs,
F/Lt Jeremiah Charles Garnett,
F/Sgt William Mathias,
F/Lt Geoffrey Percival Ormesher,
AC2 Alan Ralph Titford,
F/Lt Gerald Theodore Bailey.
Passengers:
F/O Alan John Reardon,
LAC Leonard Roy Victor Cox,
AC1 Patrick Fitzgibbon,
LAC Cecil Everard Charles Hoborough,
LAC Roy William Nicholls,
Cpl Henry Phillip Mills,
LAC Selwyn Thomas,
LAC Thomas Smith Wallace,
LAC Ernest Raymond Richings,
LAC Stanley Price,
AC2 Dennis Martin,
LAC Edward Joseph Lynott,
LAC Edwin Arthur George Pettifer,
AC2 Robert Owen.
Source:
http://www.rafcommands.com/forum/showthread.php?4604-F-S-William-Henry-Mathias-1836211-Died-14-9-45-644-Sqd

Crashed in unknown circumstances in a mountainous region located near Tiddim, killing all eight occupants.

One minute after takeoff from Alotau Airport, while climbing, the captain informed ground he was encountering bad weather conditions and elected to return. Shortly later, the aircraft went out of control and apparently crashed into the sea off Alotau. Some debris were found a day later but no trace of the 19 occupants. At the time of the accident, weather conditions were unfavorable with turbulence and rain due to the presence of a tropical storm.
Crew (33rd Squadron):
F/Lt Eric Clarence Beer, pilot,
F/Lt John Francis Mulcahy,
F/Sgt Francis Xavier Sullivan.
Passengers:
Sgt Keith Hugh Devenish,
AC1 Albert John Haslam,
Cpl Neil Stuart Mackay,
LAC William Douglas Goldie Stevens,
Cpl Michael Francis Moran,
Sgt Wesley Greg Doran,
F/O William Patrick Reedman,
F/Sgt James Neville Davis,
F/Sgt Kevin Francis Rutherford,
F/Lt William John Gordon,
Cpl Eastall Lochlan Eastall,
LAC Albert Grant Walton,
LAC Percy Badon Healy,
Cook Gordon Liddell,
Lt Noel Thomas Williams,
Spr Keith Smith.

The crew was performing a flight from Naha, Okinawa, no the airbase of Nichols, in the suburb of Manila. Enroute, while flying away from a cyclone in marginal weather conditions, the four engine aircraft christened 'Liquidator' hit the slope of a mountain located in the Seaboard Mountain Range, northeast of Taitung, Taiwan. All 25 occupants, among them PoW recently released by the Japanese troops, were killed.

Crashed into the sea some 10 km off Borinquen. There were no casualties but aircraft sank and was lost.

For unknown reason, the takeoff roll was aborted. The heavy bomber overran and came to rest in flames. Five crewmen were killed while six others were injured. The aircraft was destroyed by fire.
Crew killed were:
F/O Joseph C. Cochran,
1st Lt George E. Godsey,
1st Lt Joseph A. Little,
1st Lt Charles N. Roberts,
1st Lt Edward W. Williams.

About an hour after his departure from Yangon Airport, bound for Calcutta via Taungoo, the crew encountered poor weather conditions with heavy rain falls and thunderstorm activity from the monsoon. The aircraft was maybe hit by lightning, went out of control, dove into the ground and crashed in a wooded and mountainous area located near Mewaing, northeast of Yangon. The wreckage was found few days later and all 16 occupants, four crew, seven army passengers and five Royal Air Force personnel, were killed.

The aircraft left Hmwabi Air base located north of Yangon at 0606LT bound for Bangkok. About 34 minutes later, the aircraft crashed in unknown circumstances near Duyinzeik, in a zone controlled by the Japanese forces. The aircraft was destroyed upon impact and all 26 occupants were killed.

Lost without trace while conducting a troop transfer from Tacloban to Nichols AFB. The aircraft may have crash into sea somewhere in The Philippines. No trace was ever found.
Crew:
Pfc Manuel S. Alderette,
Cpl John C. Backius,
Pfc Joseph M. Barone,
Cwo George W. Bloomer,
Sgt William B. Campbell,
Tec Paul P. Dunlap,
Pvt James B. Ellis,
Sgt Kingdon G. Ford,
S/Sgt Paul A. Gallick,
Pfc Thomas E . Gehringer,
F/O Robert E. Gennette,
Cpl Richard A. Gess,
Pfc Ernest Huber,
Cpl Broadus F. James,
Tec Edward M. Kelly,
Tec Noel N. Knox,
Pfc Lester M. Kranz,
Pvt Joseph S. Markulis,
Pfc Leo W. Matson,
S/Sgt Robert H. Meyers,
Tec Milton E. Miles,
S/Sgt Carlton K. Nipher,
Pfc Joseph F. Peragine,
Sgt Melvin R. Robinson,
Pfc Grant C. Ruchti,
Cpl Doyle L. Simmons,
Tec Lloyd E. Smith.

The crew was performing a mission to the Middle East and the takeoff run was completed by night and poor weather conditions. At liftoff, the aircraft stalled and crashed. All four crew members and 13 passengers were killed while seven others were seriously injured.
Crew (78th Squadron):
F/O Guy Wilberforce Venables,
F/O Arthur Ernest Venables,
F/O John Edward Dickson,
F/Sgt Eric Frank Dean.
Passengers:
Cpl Headley Brightmore Archer,
LAC Robert Bell,
LAC David Briddock,
LAC Walter James Chaimberlain,
Cpl George Eric Coldwell,
LAC Ronald Fulstone Elliott,
LAC Victor Robert Haddock,
LAC Alfred Edgar Hamshere,
LAC George Brice Jones,
LAC John Ivor Morgan,
LAC Ronald Richards,
LAC Edmund Stuart,
Cpl Joseph Hutchinson.