Marc Pourpe Return Flight 1914: Sudan 5 m. red postal stationery envelope mailed on the return flight from Khartoum to Cairo, cancelled by manuscript cross with large circular 'POSTE AERIENNE / CAIRE-KHARTOUM / L.N.A. / 1913-14' struck in blue. Egypt 3 m. yellow applied and tied by Heliopolis cds in black (Feb 3) with information strike below and Cairo cds on reverse. Extremely rare with just 35 covers carried. Signed Todd AIEP. (Image 1) (Image 2) (Image)