Notable among his kills were the half dozen against the formidable Bristol F.2 Fighters.

Piloting a two-seated Bristol F.2 Fighter, he scored all his triumphs in the first four and half months of 1918.

By late 1917, he was posted to 22 Squadron as a Bristol F.2 Fighter pilot.

Only a few prototypes were built, as although it had good performance, the Bristol F.2 Fighter was preferred.

By early 1918, he had been posted to 22 Squadron as a Bristol F.2 Fighter pilot.

He was killed in a collision with a Bristol F.2 Fighter on 14 July 1919.

He was credited with 11 confirmed aerial victories while piloting a Bristol F.2 Fighter.

Letts next changed to a Bristol F.2 Fighter and scored on 4 May 1917.

He was credited with ten confirmed victories while serving as an observer/gunner in Bristol F.2 Fighters.

When tested, it was found to have poorer performance than the Bristol F.2 Fighter which was already in service and had sluggish controls.