When was the last time you took a train from Paris to New York?
Not taking the flight at all can also be an option. If you really need to, well contributing 18 euros to support less polluting infrastructure such as trains is not that big a price to pay.
Right after I sold my beachfront house in Arizona.
Eg: 'When I sold my Manhattan mountain lodge.'
Usually it's used to imply something is obviously false and impossible. While there is no song about a train from NYC to Paris the similarity should be obvious.