1. Information Services Division, United Airlines, 1200 East Algonquin Road, Elk Grove Village, IL 60007.
2. Department of Civil and Environmental Engineering, University of Alaska–Fairbanks, P.O. Box 755900, Fairbanks, AK 99775-5900.
3. Department of Environmental and Civil Engineering, Southern Methodist University, P.O. Box 750335, Dallas, TX 75205-0335.
4. Department of Civil and Environmental Engineering, Maryland Transportation Initiative, University of Maryland, 1173 Glenn L. Martin Hall, College Park, MD 20742.
5. Department of Civil Engineering, Kind Saud University, Riyadh, Saudi Arabia.