Luke was under investigation for longer because he had killed a terrorist.
The person who had been struck in the eye with Luke's knife had died on the spot.
Luke, however, wasn't afraid.
The dead person had been one of two bombers on board. He wouldn't be punished for killing the guy.
The other bomber was the guy whose face Damon had smashed in.
After Damon had knocked out the middle-aged man in first class, the father and daughter had immediately taken action.
When Luke had flung his knife at one bomber and Damon knocked out the other, the girl had thrown the middle-aged man's Nokia phone out from behind the curtain.
The phone, which was as heavy as a brick, had easily knocked out the last terrorist.
Both Luke and Damon had only broken out in a sweat later when it was discovered that the phone had actually been a detonation device, while another detonation device had been on the guy knocked out by the phone.