Fleet commonality
Standardization of aircraft parts
From Wikipedia, the free encyclopedia
In aviation, fleet commonality is the economic and logistic benefits of operating a standardized fleet of aircraft that share common parts, training requirements, or other characteristics. Fleet commonality has been shown to be positively associated with operating performance.[1]

The first client of Airbus is among the companies who have (or have had) all the Airbus models (A300, A310, A318, A319, A320, A321, A330, A340, A350 and A380). According to Air France, the subsequent commonality within the fleet has a "significant economic impact"[2]
