The report, “The CIA and the U-2 Program, 1954-1974,” written by Gregory Pedlow and Donald Welzenbach, outlines the CIA’s involvement in the development of the U-2 spy plane.
It explains how the testing of the planes led to a massive increase in UFO reports.
“High-altitude testing of the U-2 soon led to an unexpected side effect — a tremendous increase in reports of unidentified flying objects (UFOs),” it says in a section devoted to the issue.
The reason? No, not swamp gas.
In the mid-1950s, most commercial airliners flew between 10,000 and 20,000 feet, while military aircraft such as B-47s and B57s flew below 40,000 feet.