1915/1917, cover trio with military aviation mail, comprising a letter-card preprinted in red "Aviation de Dijon" - Correspondence Militaire F.M. from Dijon, 12.2.16, to Clermont-Ferrand, further an illustrated envelope "Aviation Militaire" and depiction of a plane from Bron, 30.3.17, to Troyes, together with a third cover with cachet "1er Groupe D'Aviation" addressed to Saint-Cyr. F/VF condition. (Image)