Nothing happened to the alleged terrorists.
The flight turned back to Amsterdam, where they were made to get off, then released, they probably caught the next flight to Mexico, which didn't fly over US airspace.
Apparently you couldn't be bothered to read the article before posting.
...............where they proceeded to illegally cross Americas Southern border in secret in preparation for a terrorist act within the US.
................where they proceeded to a large Northern Mexican city where they could book a flight such that there would be NO 3 hour lead time to get a warning before the plane that they hijacked was plowed into Houston, San Diego or LA.
And even as we speak they are migrating across the southern border...no problems there../sarcasm