The interesting bit (from the book IIRC) is that the copiers will often wait some time so it seems like they are not copying. This is why the risk to subsequent air travel increases after some delay from the original incident. People are partially unpredictable, so it's possible to have an immediate copy as well.
Discussing any behavior, especially in the media, makes it more likely.
https://en.wikipedia.org/wiki/Copycat_suicide (Werther effect)
The interesting bit (from the book IIRC) is that the copiers will often wait some time so it seems like they are not copying. This is why the risk to subsequent air travel increases after some delay from the original incident. People are partially unpredictable, so it's possible to have an immediate copy as well.