Is saying "have a safe flight" to someone considered rude when they aren't the ones operating the aircraft? It makes sense to say "have a safe ride" when they drive, but for some reason, when you talk about an airplane, it makes it seem as though you're implying that the plane has a high probability of something unfortunate to occur. Regardless if a friend or someone at the airport giving you the ticket [what is the word for that?] says it, would one presume it was a kind gesture [right word?], or would they take offense to it? Thanks so much.