The Douglas Invader was ordered by the USAAF as a heavily armed attack aircraft designated A-26. It was produced in several versions with the initial deliveries in April 1944. The Invader saw service in several theatres of WW 2, Korea and Viet Nam. When it came into service it was the fastest bomber of the USAAF and saw service into the 1970's. After WW 2 many were converted for executive travel, photography, survey work and forest fire fighting. FPGP and CBK, both built as B-26Cs in 1944, were registered with Air Spray 1967 Ltd. of Edmonton. 

The specifications for the Douglas B-26B:

source: Encyclopedia of World Aircraft

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