Greenland reported light formation observation — February 1953

Data reported. AIR INTELLIGENCE INFORMATION REPORT SUBJECT: Unidentified Flying Objects DATE: 13-255-53 PAGE: 3 of 4 The text in the document states the following: On the upper air observations it was noted that a temperature inversion existed at an altitude of 3300 feet and possibly also at the 4600 feet level. PLANNED PROJECT INDICATOR (PPI) 5390 was reported to this office and the Group Interrogation Sessions. Lucas, a Civilian Airborne Air Traffic Controller in a C-54, observed an unidentified aircraft climbing and accelerating rapidly to approximately 50,000 feet. The unidentified sighting was tracked for a distance of three miles before it faded from the scope. The MATS C-121, which was on the downward leg of the traffic pattern at the time, had already passed over the center of the field at an altitude of 12,000 feet when the above incident occurred. The MATS C-121 on its downwind leg passed over the center of the field at an altitude of 11,000 feet.