Early B-17D at Wright Field. The "D" model was the last B-17 series to have a small "shark-fin" tail and underside "bathtub" gun position. (U.S. Air Force photo)
U.S. Air Force
circa 1941 <div style="display: none;">date QS:P,+1941-00-00T00:00:00Z/9,P1480,Q5727902</div>
<a rel="nofollow" class="external free" href="https://media.defense.gov/2008/Jul/17/2000692425/-1/-1/0/080717-F-1234P-001.JPG">https://media.defense.gov/2008/Jul/17/2000692425/-1/-1/0/080717-F-1234P-001.JPG</a> at <a rel="nofollow" class="external text" href="https://www.nationalmuseum.af.mil/Upcoming/Photos/igphoto/2000692425/">gallery page</a>