Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

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Case XI (Serial 1550. 00}
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On March 20, 1950, a Reserve Air Force Captain and an airlines
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Captain were flying a commercial airlines flight. At 21:26, the airline
Captain directed the attention of the Reserve Air Force Captain to an object
which apparently was flying at high speed, approaching the airliner from
the south on a north heading. The Reserve Air Force Captain focused his
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attention on the object. Both crew members watched it as it passed in front
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of them and went out of sight to the right. The observation, which lasted
about 25 to 35 seconds, occurred about 15 miles north of a medium-sized
city. When the object passed in front of the airliner, it was not more than
1/2 mile distant and at an altitude of about 1000 feet higher than the airliner.
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The object appeared to be circular, with a diameter of approximately
100 feet and with a vertical height considerably less than the diameter,
giving the object a disc-like shape. In the top center was a light which was
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blinking at an estimated 3 flashes per second. This light was so brilliant
that it would have been impossible to look at it continuously had it not been
blinking. This light could be seen only when the object was approaching
and after it had passed the airliner. When the object passed in front of the
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observers, the bottom side was visible.
The bottom side appeared to have
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9 to 12 symmetrical oval or circular portholes located in a circle approxi­
mately 3/4 of the distance from the center to the outer edge. Through these
portholes came a soft purple light about the shade of aircraft fluorescent
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lights. The object was traveling in a straight line without spinning. Con­
sidering the visibility, the length of time the object was in sight, and the
distance from the object, the Reserve Air Force Captain estimates the
speed to be in excess of 1000 mph.
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