This must have already been discussed, but searches don't bring it up:
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https://www.bbc.com/news/world-us-canada-67699117
Accused stowaway flies from Denmark to LA with no ticket or passport
By Max Matza
BBC News 2023.12.12
US officials have charged a man with being a stowaway after he disembarked in Los Angeles from a Copenhagen flight without a ticket or passport.
... had Israeli and Russian ID cards with him, citizenship is currently unknown
... said he might have had a plane ticket... but was not sure
... no record of him being booked for any flights to the US or having requested any visa for entry
... Officials were also unable to determine how he came to be in Denmark in the first place
... had no memory of how he found himself on a Scandinavian Airlines flight to the US,
... crew members said he moved throughout the plane, switching seats several times