FlightAware ✈ Photo of B27 | Aviation, Fighter jets, Air
B-17 Flying Fortress, Vol. 2: Boeing's B-17E through B-17H in World War II (Legends of Warfare: Aviation): Doyle, David: 9780764361296: Amazon.com: Books
B27 Bomber Stock Photo - Download Image Now - Activity, Air Vehicle, Airplane - iStock
List of Boeing B-17 Flying Fortress variants - Wikipedia