Research news
Bitesized UFOs #045: The Racetrack UFO, April 1964
Multiple mystery radar contacts flying racetrack patterns between 60,000 feet and above 90,000 feet over California, F-106 Delta Dart scrambles, U-2 spyplanes ordered to identify targets - just another case from the rich history of UFO sightings over the last eight decades, brought to you by Bitesized UFOs.
See more (external link) 
https://www.youtube.com/watch?v=y9wUZZSKYK8