The aircraft used in the movie was owned by the 3M Company
Kurt Vonnegut Jr., author of the book this film was adapted from, was a Prisoner of War in World War 2. He was captured during the Battle of the Bulge while a battalion scout with the 106 Infantry Division on December 22, 1944, and used these experiences in his novel when Billy Pilgrim is captured by the Germans and sent to a POW camp.
In an early scene when Billy's mother is visiting him in the hospital, she is talking about Billy's Dresden experience to Elliot Rosewater -- the title character from Kurt Vonnegut's 1965 novel, "God Bless You Mr. Rosewater", and a character who was later portrayed by Ken Hudson Campbell in '_Breakfast of Champions (1999)_' .