Germany: https://www.warhistoryonline.com/military-vehicle-news/captured-b-17-bombers-in-world-war-ii.html?A1c=1 google search https://www.google.com/search?q=german+captured+b-17&rlz=1CAJIKU_enUS1021&ei=npGqY8eBC_CxytMP05W68A4&ved=0ahUKEwjHyM_jlpn8AhXwmHIEHdOKDu4Q4dUDCBA&uact=5&oq=german+captured+b-17&gs_lcp=Cgxnd3Mtd2l6LXNlcnAQAzIFCAAQgAQyBQgAEIYDMgUIABCGAzIFCAAQhgMyBQgAEIYDOgkIABAIEB4QsAM6CwguEMcBEK8BEJECOhEILhCABBCxAxCDARDHARDRAzoLCAAQgAQQsQMQgwE6CwguEIAEELEDEIMBOggIABCABBCxAzoLCC4QxwEQ0QMQgAQ6BAguEEM6BAgAEEM6BQguEJECOgUIABCRAjoICC4QsQMQgwE6DgguEIAEELEDEMcBENEDOgcILhCxAxBDOggILhCxAxCRAjoLCC4QsQMQgwEQkQI6EQguEIMBEK8BEMcBELEDEIAEOggILhCxAxCABDoICC4QgAQQsQM6BwgAEIAEEAo6BggAEBYQHkoECEEYAUoECEYYAFD_FliDOmCxPGgIcAB4AIABZYgB3wuSAQQxOS4xmAEAoAEByAEBwAEB&sclient=gws-wiz-serp&surl=1&safe=active&ssui=on#ip=1
Japan: https://www.historynet.com/japans-fleet-flying-forts/ B-17 + B-25 experiment: https://worldwarwings.com/a-sort-of-japanese-b-17-b-25-hybrid-many-dont-know-about/ https://www.historynet.com/lost-mountain-range-why-japans-forgotten-four-engine-bomber-never-saw-combat/
