By far my worst flight was in November 0f 2001, shortly after 9/11. I flew down to Florida from Syracuse with a group for a wedding, and was flying home alone as I had to return a day earlier than the rest.
I woke up the morning of my flight home, which was on American Airlines, and turned on the TV. Flashing news story - an American Airlines Airbus had crashed in Queens and terrorism was suspected.
Drove to the airport an hour later, still not knowing what had happened. Boarded the flight, the crew had a moment of silence for the loss of their counterparts, and the entire plane was just scared sh!tless.
Took a connecting flight through Chicago I believe, and it wasn't until I arrived home that we found out the crash was not terrorism. Never been afraid of flying but I was a mess that day.