On one note I can see a certain economy with hub and spoke, but in a far greater sense, vast inefficiencies. The entire "system" gets pushed beyond it's capacity during any bank of flights, and then sits like a virtual ghost town for the next 2 hours. Try getting in to any major hub during a bank arrival and it's major delays. Case in point; SFO. If we had arrivals during the "down time", regardless of the weather, rarely any delays. During a UA bank, regardless of weather, you can count on anything from holding to ground stops. The same argument holds true for the ground workers and airport facilities as well. You need the staff and airport infrastructure in place to attempt to handle 75 flights at once, then that same staff sits until the next bank along with unused gates. During the first bank of departures at IAH, CO has over 90 departures scheduled during 1 hour. Allowing for NO arrivals and NO OTHER airline operations, in perfect weather, this guarantees that the last departure will already be 30 min late. One reason we at SWA tend to have at least decent on time performance is because we're not "fighting ourselves" all trying to get in to and out the same airport during the same 60 min window.
Southeast Of Disorder