I read about something similar to this a few months back but with a lot more believable story.
Hah, found it, this is from the Jeremy Clarkson book, "I know you got soul". Basically a book about the greatest machines in his opinion.
Jeremy Clarkson on the Blackbird
Jeremy wrote:
In the mid sixties an RAF fighter pilot was cruising down the east coast of England in his Lightning when he saw something unuasual. "It looked exactly like on of those sci-fi Airfix kits that I'd had as a boy in the fifties." he told me years later.
Opening the taps a little on his fighter, he came up behind the mysterious plane for a better look. The USAF markings identified it as a friendly so he pulled alongside to wave at the pilot. But he never got a chance because when the Americans saw him coming: whoomph. With an explosion of noise, they, and their astonishing machine, were gone. "I simply could not believe how fast it was." he said.
Back at his base his colleagues were skeptical. "I see," they said, "so you saw a huge black plane that spewed circular blue flame out of its engines and rocketed away so quickly you couldn't keep up." It did sound absurd because, at the time, everyone knew with absalute certainty, that just about the fastest plane in the sky was the Lightning.
Everyone was wrong. Because what the RAF pilot had seen was the SR-71. The Blackbird. And it wasn't just the fastest plane in the world then. It's the fastest plane in the world now too.
SR-71 BlackbirdSecondly
The account, first published in Britain’s Daily Star
The daily star is like a porn mag but in newspaper format, I'd take any story from them with a pinch of salt.
Daily Star home page