Lot of two envelopes, one signed by Jean Mermoz. - First transatlantic airmail May 11-13, 1930, France - South America. Outward journey Departure: May 11, 1930 Arrival: May 13, 1930 in Rio Grande. Signature of Pilot Jean Mermoz. - Return trip: South America - Toulouse, May 18, 1930. Card addressed to the sender of the letter opposite by Louis Cavailles, chief mechanic. Provenance: Acquired by a grandfather who worked for the aeropostale in Toulouse, then by descent.