Federal Aviation Administration official Sharon Pinkerton says the agreement will solve the problem of excessive delays at the Chicago airport that have slowed travel nationwide.
United and American handle 88 percent of all flights at O'Hare. Other airlines will also make cuts.
Pinkerton held a conference call with congressional aides to outline an order that's to be signed later today by Transportation Secretary Norman Mineta and FAA Administrator Marion Blakey.
Pinkerton says the order will take effect November First and run through the end of April 2005. Mineta and Blakey are in Chicago Wednesday to announce details of the plan.