1936 Imperial Airways flight London - Paris, September 25th. The plane left Croydon around noon but disappeared while crossing the Channel. It was never found, A mail bag was found on the beach at Cucq (near Calais) France, one month after disappearance. On reverse of the cover the red cachet and labels from the French post, on front the arrival mark Nairobi November 9th and the blue cachet DELAYED SALVED FROM BOADICEA, a fine cover, Nierinck 360925b