This is a really odd case. Like how did no one see what was happening? Maybe they assumed she was his wife and that it was legal to marry teens in his country? But most people would still report it if it was two consenting adults. And since this was a minor… shouldn’t the flight crew be keeping an eye on her a bit? Maybe it was very quick or something, it’s hard to tell the duration of the assualt. But seems some review of procedures is in order to see what if anything can be done to prevent such a thing in the future.

And that he completely confessed? Does that get extremely beneficial treatment in sweden? In the US even the most obviously guilty plead not guilty.