It's a boat sailing from Evian where he lives to Lausanne where his daughter lives, and Jean-Jacques Perrey remembers his 18 return trips with the Paquebot France in the sixties, between the U.S.A. and France. The american flag was borrowed at the Beau Rivage palace in Lausanne. We had some diplomatic discussion with the company who owns the boat, because it's wearing 3 flags at this moment of the film: the french one, the swiss one and the american one.