Question: Which air transport operations hub was commanded by the most recent serial killer profiled in the book Cold North Killers: Canadian Serial Murder?
Sentence (from "Raymond Fernandez and Martha Beck"): Raymond Martinez Fernandez (December 17, 1914 – March 8, 1951) and Martha Jule Beck (May 6, 1920 – March 8, 1951) were an American serial killer couple.
Relevant evidence: No