Schansman had dual Dutch and U.S. citizenship but did not board the plane with a U.S. passport, State Department spokeswoman Jen Psaki said during a press briefing. He had been flying to Malaysia to meet up with family members on vacation, according to USA Today.
A Facebook profile that appears to belong to Schansman shows he had moved to Amsterdam in April to attend the International Business School at Hogeschool van Amsterdam.
Schansman's Facebook profile also lists his sister and mother as living in the Netherlands. TV station KPIX reported that a man believed to be his father, Thomas Schansman, has an address in Menlo Park, Calif.
A friend who went to high school with Schansman described him as "kind" to NBC News.
"He stuck up for you and made you laugh when he saw there was something wrong," Fabienne Schriek told the news outlet.
A Dutch football club, Olympia '25, said Schansman was a former player and gave its condolences to his family in a statement. The club said Schansman's brother is expected to join the team next year.
This post has been updated.