Question: In which city are the headquarters of the multinational defence, security and aerospace company, one of the world's largest and ranked 3rd based on revenues in 2015, which has the subsidiary British Aerospace? 
Sentence (from "British Aerospace 146"): A further-improved version with new engines, the Avro RJX, was announced in 1997, but only two prototypes and one production aircraft were built before production ceased in 2001.
Relevant evidence: No