However, the type was not a success, being unreliable and uneconomic to operate;it was withdrawn from service after a series of fatal accidents.

Five of the eleven aircraft built were written off in accidents and one was lost during World War II.

[1] The Latécoère 631 was the result of a specification issued in 1936 by the Direction Générale de l'Aviation Civile for a 40-passenger airliner with a range of 4,000 kilometres (2,500 mi).

[2] Construction of the aircraft was stopped due to the outbreak of World War II and was not resumed until after the signing of the Franco-German Armistice in 1940.

[4] However, WW2 would soon intervene;flying boats were turned to military purposes and developments in the war reshaped post-war air travel.