The WW-II Republic P-47 'Thunderbolt' fighter on display at the ND Centennial Air Show by the old Hector Airport terminal, Saturday 8/19/1989.

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 P-47D-40 also featured provisions for 10 "zero length" stub launchers for 5 inch rockets. The bubbletop P-47s were nicknamed "Superbolts" by combat pilots in the field. -wiki