I experienced the same LAXFRA on LH last month - passenger walks through business, body almost insignificant compared with his rucksack. and disappears down the back, followed by the unbelieving gazes of the crew at the door.
There were 5 points of contact/control before he got to his seat and lumbered the crew in that compartment with the almost impossible task of stowing his carry/wear-on
1. Check-in
2. TSA pre-check
3. TSA security check
4. Gate agents
5. Door crew
But of course it's easier just to let it slide and let other passengers be inconvenienced, all the while incanting "We have a full flight today, so please stow your carry-on under the seat in front of you.
At least he didn't stow it in a business class overhead on the way through which happens more often than you'd want to believe....
Last edited by RevMan2; 11th Sep 2012 at 11:59.