The astronauts - who paid $55m each for the rocket ride and accommodation - object to being called space tourists as they were conducting research.
The four businessmen say they are not tourists as they were conducting commercial scientific research while on board.
The three paying customers were: Larry Connor of Dayton, Ohio, who runs the Connor Group; Mark Pathy, founder and chief executive of Montreal's Mavrik Corp; and Israel's Eytan Stibbe, a former fighter pilot and founding partner of Vital Capital.
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