As a result:
The passengers have now officially entered Iran,
and no longer are allowed to enter the US under
the visa waiver program. This means if any of
them are flying onwards from Oslo to New York
(which many are) they have to go to a US embassy
and ask for permission. They might have to do it
for the rest of their lives.
[1]: https://www.airlive.net/boeing-737-max-8-stuck-in-iran-since...