Dolley
The easy answer to the conundrum would be if the OP, Flybee, would be kind enough to verify the source and add any other detail that might be relevant.
However, in the OP opening line "Please read this letter that an Italian Cabin Crew wrote to passengers talimg about Alitalia sitautuions. " implies that the letter was most likely to have been handed out.
Something we wont know for sure without further information.