Several air forces have operated the A310 as a pure transport under the A310-300 MRT (Multi-Role Transport) designation. EADS later converted part of that fleet to the MRTT (Multi-Role Tanker Transport) configuration, which adds air-to-air refuelling and turns a transport into a range multiplier for the operator's own fighters.
The documented conversions
At least six conversions have been completed: four for the German Luftwaffe and two for the Royal Canadian Air Force. Deliveries began in 2004. Three aircraft were converted at EADS EFW in Dresden, Germany, and the other three at Lufthansa Technik in Hamburg.
Military operators
The Royal Canadian Air Force designates its aircraft CC-150 Polaris; they came from an order originally placed by Wardair and delivered to Canadian Airlines. The other recorded military operator of the A310 is the Spanish Air and Space Force.