WW-II fighter pursuit aircraft: the Republic P-47 'Thunderbolt' taxis to the old Hector terminal at the ND Centennial Air Show. Saturday 8/19/1989.
Photo by Bob Nelson.
Cutting down the rear fuselage to accommodate the bubble canopy produced yaw instability, and the P-47D-40 introduced a dorsal fin extension in the form of a fin running from the vertical tailplane to just behind the radio aerial. The fin fillet was retrofitted in the field to earlier P-47D bubble-top variants. The bubbletop P-47s were nicknamed "Superbolts" by combat pilots in the field. -wiki