Originally Posted by
CanadianBacon
But that somewhat contradicts what you had in your original post:
Regardless of what you want to be the case, as someone already pointed out, in terms of traffic IAH and EWR are United's main hubs.
Plus, you have to realize that they probably only want to devote a certain number of pages on terminal diagrams. If they're trying to limit that number to two pages, what they've done makes sense since in order to even things up (in your mind), they would have to scale all of their diagrams to 1/3 of the page, which is more difficult than trying to scale a diagram from half a page to a quarter page, or vice-versa.
Assuming they had to pick two to share the same page, why wouldn't they pick the hubs that most of their customers are going to travel through?