Our cover of Oct. 7, 1957, showed the first Lockheed L-188 Electra mid-range transport after completion of structural assembly at the company's plant in Burbank, California.

Developed from the commercial L-188 Electra, the P-3 is distinguished by its tail stinger, or MAD boom, used for the magnetic anomaly detection (MAD) of submarines. In total, 757 P-3s have been ...