Ailerons	lateral control flaps at the rear of the wingtips
Bomber stream tactics	bombers took off from different points on the circumference of a circle whose centre was the target. They converged on the target and fanned out again after bombing. This strategy eliminated concentrations of bombers which would attract enemy fighter attacks.
Brisfit unit	Bristol fighter unit
Dead stick landing	landing without engine power
Flight	five to six aircraft
Flik	nickname derived from the diminutive form of the Austrian word for squadron
Flying circus	German group of about three squadrons
Gong	medal, decoration
Grease-monkey	mechanic
Group	collection of Wings
Jasta	diminutive of Jagdstaffel
Mayday	distress signal from the French “m’aidez”
DH 9 day-bomber	A de Havilland day-bomber. This light semi-fighter aircraft was used for daytime missions. The night bomber was a heavier plane with sometimes as many as four motors.
Panzer division	from the German Panzerkampfwagen meaning an armoured fighting vehicle, hence an armoured division
Rotary engine	engine in which the cylinders are mounted in a circle; both engine and propeller rotate around a stationary crankshaft
Squadron	three Flights
Tiger convoy	convoy of heavily-armed merchantmen; the addition of armament reduced the cargo capacity but the ships could defend themselves. Their greater chance of getting through enemy attacks was calculated to outweigh the decrease in size of the shipments.
Top cover patrol	defensive patrol maintaining the highest possible altitude above a bomber formation or similar group of aircraft.
Torque action	tendency for the craft to spin in the direction of the propeller
Tour	term of duty
Wing	two to three Squadrons
Zoom	a steep climb at full power