In a deleted scene, after Tom asks "When am I going to California?", Vito answers him:

Vito: Tom, you're not Consigliere yet. And to tell you the truth, I don't know if you will ever be. But I do know one thing for sure. When I tell you to do something, do it, no questions asked. 25 years or not in my house; Sonny's friend or not. I'll cut out your stinkin' Irish heart in a minute, throw it in the fire, and dance a jig around it. Capite?

Tom: I ... well, I was just asking because I have to try and get a priority pass from that Pentagon officer friend of mine to fly out there and it's the weekend and all.

Vito: Oh. I see. Well then, my mistake. Too much wine. Love ya Tom.