1919 (Apr 7) Piece from an O.H.M.S envelope to Cairo with Base Army Post Office Z c.d.s (Alexandria), oval "Third Echelon" cachet and black boxed "AERIAL POST / E.E.F", used by the R.A.F emergency air service, very scarce in black.

1925 Cairo-Kano-Cairo R.A.F Flight. Long O.H.M.S cover (left side folded over) bearing datestamps of post offices visited by the R.A.F ground party led by F/Lt Greenham, who constructed landing strips along the route. Bearing Chad 45c cancelled at Abecher (Nov 14) and Sudan 10m cancelled at Geneina (Nov 21), with datestamps of Adre (Nov 19) and El Fasher (Dec 22), very unusual and rare.

1927 Covers flown by Imperial Airways from Cairo to Basra, one to Karachi carried on the first flight (Jan 12), another carried on the first weekly flight (Apr 13), two bearing 27m air stamps. (3).

1932-38 Covers including 1932 cover from Malakal to Atbara with "INSUFFICIENTLY PAID FOR / DESPATCH BY AIR MAIL", 1932 first flight at 15m rate from Khartoum to Malakal or Cairo, 1933 Khartoum to London carried over first Cairo to Alexandria air link, 1933 first accelerated service from Atbara to London or London to Khartoum, 1935 London to Wadi Halfa diverted via Malta, 1935 Cairo to Bucharest first flight via Athens to Warsaw, 1935 Cairo to Limassol first flight, Cairo to Tanga first day service, 1937 Southampton to Alexandria first experimental flight, 1937 Vienna to Luxor first accelerated service, 1937 Alexandria to Nicosia first flight, 1938 London to Khartoum first regular accelerated service, etc. Also "Sudan Airmail Service by Imperial Airways, Rates & Latest Times of Posting, Winter 1933-34" leaflet. (18).