Lifestyle that involves freely travelling to major cities of the world and always going for the most expensive accomodation. Synonymous with Haute couture, aristocracy etc.
Those who bash the jet set lifestyle will 99.9% of the time not be able to afford it. The other 1 in 1000 people who discriminate against it are usually former jet setters too old for travelling much, have a fear of flying (but there's always boats) or simply live in a cave.
a group of wealthy people who travel from place to place regularly
Here come the jet set. Pretend you don't notice.