C ommercial airliners were like buses, Milgrim decided, staring at the textured ceiling in his room in this Best Western. But a Gulfstream was like a taxi. Or like having a car. He wasn’t ordinarily impressed by wealth, but his Gulfstream experience, Vegas decor aside, had left him struggling with issues of scale. Most people, he assumed, would never set foot on one. It was the sort of thing you knew existed, that you took for granted, however theoretically, as something some people owned. But most people, he now suspected, would never have to get their heads around the reality of the thing.