The first dinosaur's victim should have been... (may contain spoilers)
... Charlie. That bloated butterball blob of sweating tallow from hell, constantly whining about food, drink, heart condition, claustrophobia, etc. All passengers, I mean, all of them, including the brainless air marshal who was obviously poorly trained for emergency situations, and lost her cool (despite all deceiving appearances of being cool just because she was the one with guns), all the crash survivors were unbearably irritating to nauseating intensities but at varying degrees...
But Charlie, oooooooh Charlie ! I mean, I rooted for the other brainless chickens simply because he managed to be so extremely confrontational and unsympathetic that he would have deserved being the first kill. He was so good at finding exactly the worst things to say or to answer to his companions of misfortune to make him a valuable member of the group. Although the dinosaur managed to get rid of every other one (but two), I wanted him to go first, so that I would have been better armed to bear with the others. No matter how hard he tried after to make up for the unforgivable, totally unacceptable and antisocial behavior of his after and even before the crash (remember his verbal confrontation with the stewardess before takeoff when he wanted a drink so badly and was almost on the verge of being insulting towards the attendant?).
It's the buildup of hostility, the wall of hatred he managed to erect between him and the audience (as most spectators likely felt assaulted by his incessant whining just as much the characters in the crashed plane) that makes me wish that he would have been the most satisfactory meal for the whatever-it-was-kind-of-a-mutant-raptor dinosaur (although dangerously rich in saturated fatty acids).