AVRO - 504

The Avro 504 was a World War I biplane aircraft made by the Avro aircraft company and under licence by others.

The first 504 was built in 1913. Production totalled 8,340 and continued for almost twenty years. It was used by both the Royal Flying Corps and the Royal Naval Air Service as a trainer, bomber and recconaissance plane. The plane was withdrawn from frontline service in the summer of 1915 but remained the standard British trainer for the rest of the war.

The 504 was the first airplane to strafe troops on the ground as well as the first to make a bombing raid over Germany. It was also the first Allied airplane to be downed by enemy anti-aircraft fire.

The 504 is easily recognisable because of the single skid between the wheels.

http://en.wikipedia.org/wiki/Avro_504K