The paragraph on Burroughs and the origins, from the same book:
Burroughs, anyway, encountered the 23 in Tangiers, when a ferryboat captain named Clark remarked that he'd been sailing 23 years without an accident. That day, his ship sunk, with all hands and feet aboard. Burroughs was thinking about it in the evening when the radio newscast told him that an Eastern Airlines plane, New York to Miami, had crashed. The pilot was another Captain Clark and the plane was Flight 23.
