Potential Movie Spoilers (Its kinda the core plot tho)
Yes this is obviously in reference to Final Destination Movie/media-franchise
By vehicle I mean like anything. Bus, Train, Boat, Submarine (like the Titan lol), Plane, anything you would plausibly travel on in your lifetime.
Even if you don’t believe them, they obviously won’t be able to enjoy the vacation unless you avoid the circumstances they’re afraid of—so you might as well humor them.