Exactly one week before 9/11, my husband and I were on a plane, heading home from a vacation. Although awake, I kept seeing a picture in my head of a newspaper with the words "plane crashes - 64 dead". Not a picture of a plane or crash, but of a newspaper article. Although nervous on this flight, I didn't feel particularly in danger. Still the picture in my head haunted me. I even felt compelled to write it down on a little piece of paper and tuck it away somewhere "just in case", and told my husband about it.
When 9/11 happened I wondered if there was any connection to my vision. But later when the news revealed that there had been 64 people on the one plane that crashed at the Pentagon, I knew it couldn't have been just a coincidence.
I also had a dream about a particular name of someone trying to contact me. The name was, with exact spelling, "Gerald Fisher" (again, it was in text form). Plenty of variations on how that could be spelled, but this was it. In searching, I found this name to be one of the victims in the Pentagon crash, although not a passenger of the plane.
Nothing was specific enough to have actually known when or where or do anything about it.
I have had other premonitions, like dreaming a person's death before they got sick (and died), or saying "there's going to be an earthquake" then one happened a couple seconds later, and many much less significant ones. On a daily basis, I find myself "connecting" with other people, often knowing what they are going to say or thinking about - things much too unlikely to be a coincidence.