In 2004 "Mustang Sally" played on the P.A. as an 86-year-old factory of this company ended production
The North American Aviation P-51 Mustang is an American 
long-range, single-seat fighter and ... Rather than build an old design from 
another company, North American ... Self was given overall responsibility for 
Royal Air Force (RAF) production ...... Hersham, Surrey, UK: Classic Publications, 
2004.