1. FAA Aerospace Forecasts, Fiscal Years 2006-2017, U.S. Department of Transportation, FAA, Office of Policy and Plans, http://www.faa.gov/data_statistics/aviation/aerospace_forecasts/2006-2017/ [cited 21 Aug 2006]
2. Credeur, L. "Basic Analysis of Terminal Operation Benefits Resulting from Reduced Vortex Separation Minima", NASA TM-1977-78624
3. Abbott, T. "Flight Test Evaluation of the Airborne Information for Lateral Spacing (AILS) Concept", NASA TM-2002-211639
4. Callantine, T., Lee, P., Mercer, J., Prevot, T. "Terminal-Area Traffic Management with Airborne Spacing", AIAA 2005-7403