The entire premise of this thread is abusrd. It's all one airline. Why would it irrationally act to improve a historic CO hub over a historic UA hub? It has traffic in both of them. As pointed out above, the IAH renovation has been long planned (and far more concretely than the vague desire to fix the problem with the "temporary" terminal at Dulles). Besides terminal B in IAH is actually comparable to the A1-A6 gates at IAD and far worse than C/D.