"Avro" was short for A.V. Roe & Co., Ltd., of Manchester and Hamble. A. V. Roe's planes may have only played a small direct part in the history of WWI air combat, but the 504 played a larger part as a trainer, and of course (unlike many of its contemporaries) the Avro firm had a history lasting long after World War One.
Production aircraft from the Great War or shortly thereafter include:
- Bruce, p.36