Investigation Summary
The flight, operated by the DC-3 named Ibis, departed Lisbon at 07:35 GMT, slightly delayed because passenger Leslie Howard had to retrieve a package from customs. The route between Lisbon and Whitchurch was a known corridor for diplomatic personnel, agents, and refugees, typically respected by both Allied and Axis powers due to Portuguese neutrality. However, by 1943, the Bay of Biscay had become a highly contested combat zone. At 10:54 GMT, the aircraft's wireless operator sent a distress signal reporting they were being followed and fired upon at 46°30'N, 009°37'W. According to German pilot accounts, which used local time (GMT+2), the aircraft was spotted at 12:45 local time and attacked five minutes later. The intercepting force consisted of eight Junkers Ju 88C-6 fighters from Staffel 14/KG 40, launched from Bordeaux. The German pilots reported spotting a grey silhouette and, failing to identify civilian markings, initiated an attack. The DC-3 was struck by cannon fire, causing the port engine and wing to ignite. Despite the crew's attempts to evade by wave-hopping, the aircraft crashed into the sea and sank. No survivors or bodies were ever recovered.
Final Conclusions
The destruction of BOAC Flight 777 was the result of a direct military attack by German Luftwaffe fighters on a civilian airliner. While German pilots later claimed they mistook the DC-3 for a military aircraft (such as a Vickers Wellington), significant evidence and historical theories suggest the flight may have been targeted based on faulty intelligence. The most enduring theory posits that German agents in Lisbon mistook Howard's accountant, Alfred Chenhalls, for Winston Churchill, who was known to be in North Africa at the time and was expected to return to Britain. Other theories suggest the target was Howard himself, who was involved in British propaganda and intelligence efforts, or Wilfrid Israel, a prominent figure in Jewish rescue operations.
Video Analysis
No video analysis linked for this case file yet.
Systems & Failure Modes
Radio Communications
The wireless operator maintained contact with Whitchurch until the attack, providing coordinates and reporting the presence of tracers before the final transmission.
Visual Identification
German pilots claimed the aircraft's grey camouflage and lack of visible markings led them to believe it was a military target.
Interesting Facts
- 01The aircraft involved, G-AGBB (Ibis), had survived two previous Luftwaffe attacks in November 1942 and April 1943.
- 02The aircraft was a Douglas DC-3-194, Manufacturer Serial Number (MSN) 1590, originally registered as PH-ALI.
- 03The flight was operated by an all-Dutch KLM crew flying under contract for BOAC.
- 04Among the 13 passengers was actor Leslie Howard, famous for his role in Gone with the Wind.
- 05The German fighters involved were Junkers Ju 88C-6 heavy fighters from the 14th Staffel of Kampfgeschwader 40.
- 06The last radio transmission was sent from 46°30'N, 009°37'W, while the estimated crash site is 46°07'N, 10°15'W.
- 07No wreckage or bodies were recovered from the crash site in the Bay of Biscay.
Safety Actions & Advisories
Route Alterations
Following the shootdown, civilian flights between Lisbon and the UK were temporarily suspended and later rerouted to avoid the combat zones of the Bay of Biscay.
Known Controversies & Unanswered Questions
The Churchill Theory
Reference ↗A widely cited theory suggests German intelligence believed Winston Churchill was on the flight because his portly accountant, Alfred Chenhalls, resembled him and was seen smoking a cigar at the airport.
Targeting of Leslie Howard
Reference ↗Some historians argue Howard was the specific target due to his high-profile anti-Nazi propaganda work and alleged involvement in British intelligence missions in Iberia.