The Glasgow/Edinburgh situation is a good analogy, though perhaps not in the way that you mean.
The independent existence of those two airports within 40 miles of each other is an accident of history. No sane person believes that Scotland needs this unnecessary duplication and there has been talk for the last 50 years or more of a single Central Scotland Airport.
But that would mean starting with a clean sheet of paper, which isn't going to happen in Scotland, nor in Yorkshire.