Chicago has changed its starting corals slightly. They are no longer called "competative" "Prefferred I" and "Preferred II." The "Top 100" is still there with the same name, but the rest are now A, B, C and D.
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Top 100 Start Corral
Secure starting area set directly behind the elite start corral. Qualifications for the Top 100 start for 2007 are as follows:
Men:
Half Marathon Time < 1:10:59
Full Marathon Time < 2:30:59
Women:
Half Marathon Time < 1:20:59
Full Marathon Time < 3:00:59
...
Start Corral A:
...
Qualifications for Start Corral A for 2007 are as follows:
Half Marathon time: < 1:25:59
Full Marathon time: < 3:10:59
Expected capacity: 1,500
Start Corral B:
Secure starting area set close to the start line for all qualifying participants. Qualifications for Start Corral B for 2007 are as follows.
Half Marathon time: < 1:35:59
Full Marathon time: < 3:35:59
Expected capacity: 3,000
Start Corral C:
... Qualifications for the Start Corral C for 2007 are as
follows:
Half Marathon time: < 1:45:59
Full Marathon time: < 3:55:59
Expected capacity: 4,000
NEW for 2007 Start Corral D:
... Qualifications for the Start Corral D for 2007 are as
follows:
Full Marathon time: < 4:00:59
Expected capacity: 4,000