+!(spitfire*.escorting~b17)..
Boeing B17 Flying Fortress Wikipedia
Spitfire IXs escorting B24 Liberators intercepted and
Up Close and Personal with Sally B Europe’s Last Airworthy
Boeing B17 Flying Fortress AviationsMilitairesnet
B17 Flying Fortress Escorted By Her Favorite Team Of P51
Escort fighter Wikipedia
Spitfire IXs escorting some B24 Liberators get intercepted
B24 Liberator WW2 Bomber Designed To Replace Flying
Europe's last B17 plane cleared to fly again from Duxford BBC
Combat box Wikipedia
World War 2 History The Messerschmidt and the Crippled B17
History The Old Flying Machine Company
The Boeing B17 Flying Fortress was Outdated When WWII Began
New B17 Movie “Wolf Hound” for Summer 2022 Aero Vintage Books
Consolidated B24 Liberator The Loyal “Lumbering Lib”