Skip to page content

Total Airspace & Airport Modeller (TAAM) Simulation Analysis

The Federal Aviation Administration (FAA) is using the Total Airspace & Airport Modeller (TAAM) to support the planning and environmental analyses of the Re-Evaluation of the O'Hare Modernization Environmental Impact Statement. TAAM is a fast-time delay and travel time computer simulation model that is being used to calculate delays and travel times as well as to provide information to be used in the Air Quality and Noise Analyses.

The Air Traffic workgroup involved in the TAAM modeling was composed of both FAA Management and National Air Traffic Controllers Association (NATCA) representatives from O'Hare Tower (ORD ATCT), Chicago TRACON (C90), and Chicago Center (ZAU). Representatives from the FAA Great Lakes Region and Chicago Airports District were also involved in the modeling. The assumptions and review process is unprecedented in scope and duration for any single airport modeling project in the U.S. for a Re-Eval. Together this workgroup represents more than 190 cumulative years of experience with and the knowledge of real-world air traffic operational issues in the Chicago area. They provided the assumptions and operational perspective on the TAAM model's depictions of future operational procedures for O'Hare International Airport.

The process for the TAAM work for the Re-Eval follows the method used for the original EIS work completed in 2003-2004. The 2003-2004 method and the 2014-2015 work conducted by Ricondo & Associates, a City of Chicago contractor, was completed at the direction, oversight, review, and approval of the FAA.

As this data becomes available in draft final form, the FAA will post the various components of each analysis including the operating assumptions, and TAAM project files. However, please be advised that this TAAM data continues to be reviewed by the FAA and may change.

For each scenario, the following directories will be available:

  • TAAM Project Files;
  • TAAM Assumptions/Results Data Package; and

TAAM is a commercially available model developed and maintained by Jeppesen. It is used to develop representative "what-if" analyses of various airfield and airspace environments. The files listed under the section TAAM Project Files are used in running the model. However, due to licensing agreements, the TAAM model itself is not available on this website.

Airfield present after the October 15, 2015 commissioning of Runway 10R/28L

Airfield present after the November 2020 commissioning of Runway 9C/27C

Caution: The files associated with this subject are very large and you may not be able to open them directly. We suggest you download and save files on your computer, then open them. Download time will depend on your internet speed and web traffic. If you have problems downloading or opening a file:

  • Confirm your internet browser is current and allows File Transfer Protocol (FTP) access.
  • Confirm you have the appropriate software application(s) to view the file
  • Try downloading during off-peak hours i.e. earlier in the morning or later in the afternoon when there is less web traffic.

If you have any problems accessing any of the information presented on this website, please email

Page last modified:

This page was originally published at: