Fast UFO flyies across mountain areas. Telsa Power???

It is said that long before I was born when my uncle was a mere Teenager a craft flew across the mountains at immense speeds, leaving a large crackling sound (assuming it was test flights to break the sound barrier around Idian Town Gap my Uncle thought nothing of it.).  
This wasn't a big deal, untill he saw 2 fighter planes come zooming after it minutes later, their speeds were much slower.  A few days later, the newspaper had sightings of a U.F.O.  
Thus ending the theory that it was an enemy spy plane that the town has come up with.  
I was told this by my cousin about a month ago near Christmas and had just remembered it moments ago.  My theory is that they (government) were using Tesla energy (large crackling sound).
We will attempt to document the actual date, and will request the newspaper articles.  Date is unknown by the source of the report.  PD