Very good, but short.
Maybe make a longer sequel.
If you really can't figure it out, I pity you, but here's a walkthrough:
Start by clicking on the third armrest from the front. Once in that seat, open the compartment and get the key. Now, open the door, and talk to the man on the left. Say you're interested in buying some weapons. After he comments, say never mind that. Ask to go somewhere more private, and you will go to a cabin, where I believe you kill him, though it's not blatantly obvious.