I found a very interesting article.
It tells the story of a flight attendant who was on one of the planes that had to land in Gander (Canada) because of Operation Yellow Ribbon, when the airspace all over the US was closed after the terror attacks in New York on September 11, 2001.
It’s very interesting to read.
https://www.inspiremore.com/plane-diverted-to-canada-on-9-11/