“By the way,” Jessamy went on, “what’s your other name? You never told me.” “Stubbs,” saidBilly, “William Stubbs!”.
(US, nickname) The B-25 twin-engine bomber aircraft used during World War Two, commonly called the "B-25 Mitchell" in honor of U.S. Army General William "Billy" Mitchell.
2003 Bradley, JamesFlyboys. New York: Little, Brown and Company. Ch 7:
Just then a squadron of "Billys" -- twin-engined B-25 Mitchell land-based bombers -- flew overhead [...].