I found a few references to this incident on the Internet, although they didn't supply much info.
This is an excerpt from an article about the Bermuda Triangle
In certain cases there have been people who disappear and then reappear. There was a case in the late 1969 where a National Airlines 727 passenger aircraft flying into Miami had lost all radar and radio contact for 10 minutes. Of course, the air traffic controller was highly freaked out by this. Ten minutes went by and communication came back on. The air traffic controller asked them where they had been, and they didn't know what he was talking about. They had no perception of anything's having happened. And when they landed, it was discovered that every single timepiece in the entire aircraft — everybody's watch, every chronometer, you name it — had lost 10 minutes! It was as if they basically just winked out of our existence for 10 minutes and then came back.
I also found a reference to it on this site.
Have you heard about a National Airlines 727 that disappeared from radar for 10 minutes while on approach to Miami airport? I believe it was in 1969. Everything seemed fine, but when the plane landed all watches on board were 10 minutes slow. Do you think when they disappeared they traveled through time briefly, or just didn't exist. Were they one of the lucky ones to escape?
Answer. I believe this first appeared in a Saga magazine article by Ivan Sanderson. He mentions it in his 1970 book Invisible Residents, but offers no source, flight number, witness, or precise date. Sanderson often credited stories that had no source. I'm afraid this is one of them—there is nothing to it.
Sounds like an urban legend to me.
I'm LoneStarMike. Join us next week for another edition of "Unsolved Mysteries".
This post has been a LoneStarMikeProduction