To start the ball rolling we have one unusual shot from Paul de Maeyer's collection which illustrates Don Hannah's point about registration letters carried on vertical tail surfaces. This Rumpler C.IV O-BREF has somehow contrived to wear the letters O-B instead of just the mandatory O, while the SNETA Breguet in the right foreground has no tail markings at all! Do any readers know of other examples of O-B marks being carried, or of similar practice being found in other countries? Your FEEDBACK please!

Самолёты на фотографии: Aircrafts on the photo: Breguet Br.14 - ФранцияFrance - 1916Rumpler C.IV - ГерманияGermany - 1916

PH-OST was the Pander S-4 Postjager c/n 46, regd 25.11.33 and intended to open up mail routes to the East Indies. It crashed at Allahabad, India, 21.10.34, where it was earlier photographed during the MacRobertson London-Melbourne Race.

Самолёты на фотографии: Aircrafts on the photo: Pander S-4 Postjager - НидерландыNetherlands - 1933

Westland Widgeon G-EBRN see before setting off on Wing Commander Manning's unsuccessful Australia flight in 1928

Самолёты на фотографии: Aircrafts on the photo: Westland Widgeon - ВеликобританияUnited Kingdom - 1924

Probably the best-looking of the biplane airliners was the DH.86. G-ADUE "Dardanus" of Imperial Airways posed at Hatfield on 23.3.37 and illustrates our article on C of A Applications.

Самолёты на фотографии: Aircrafts on the photo: De Havilland Express Air Liner / D.H.86 - ВеликобританияUnited Kingdom - 1934

An evocative shot of Avro Avian G-EBWK taken 8.3.28 at an unidentified, but misty, location.

Самолёты на фотографии: Aircrafts on the photo: Avro Avian / Type 594/616 - ВеликобританияUnited Kingdom - 1926

One of the first members of the 1920 SNETA fleet was this DH.9 O-BIEN which outlived many of its contemporaries and was not scrapped until 1931.

Самолёты на фотографии: Aircrafts on the photo: De Havilland D.H.9B / D.H.9C - ВеликобританияUnited Kingdom - 1919