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After World War I he returned to Mexico, where he met and married a young woman named Modesta Escalante, subsequently drifting on to British Honduras and becoming involved in a number of nonflying and apparently not too successful activities. He ran a commission firm in the export-import business, became the French consular officer in 1935, and later served as airport manager for Pan American before budget constraints closed that operation.
In the mid-1930s, Masson tried to interest publishers in a book he had written about his flying experiences during the Mexican Revolution, but he apparently found no takers. Unfortunately, the whereabouts of that manuscript is unknown.
When France surrendered to the invading Germans on June 16, 1940, Masson resigned from his consular post. He left British Honduras in 1942 to work as the manager of the Hotel Iris in Chetumel, Mexico.
He died in Merida, Yucatan, on June 2, 1950.
From http://historynet.com/ahi/bl-air-sea...nt/index1.html
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