So the last thing Michael said to Carlo is, "Come on -- get outta my sight." Just before that, though, he says, "There's a car waiting for you outside to take you to the airport. I'll call your wife, to tell her what flight you're on."
So, do you think that call took place? If so, what was said? I can see Michael at his desk: "Connie? This is Michael. I just wanted to let you know that Carlo just left...uh...for the airport. His ticket is for Flight 41, arriving at 10 tonight. What? Uh, no. I wouldn't go to meet the plane if I were you."
Oh no! Michael didn't want to give Carlo any indication about what was about to happen to him, so he told him something that seemed normal and natural to reassure him.
What I want to know about that scene is how and when did anyone get ahold of Carlo's luggage.