prevailing winds, weather, intersecting runways, LAHSO procedures, lake effect (regarding changing winds), noise abatement, traffic, etc..etc.. are all reasons for the delays caused at o'hare. How would you like to haev 25 jets set up as far out as dubuque iowa and st louis to approach a certain runway and then after having 3 of those a/c land the wind changes and instead of being out of the west (about 300-330 normally in the midwest) they are now out of the east (around 070-150). They need runways that can accomodate a/c of all types that do not intersect (read parallel). I think they are tearing up a few runways as well aren't they? the biggest changes ever seen in the chicago airport system will take effect within the next 10 years, whether it is slot controls, utilizing other airports, or current airport expansion.
Do you like movies about gladiators?