1. Laboratory for Aviation and the Environment, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02140, United States
2. Federal Aviation Administration, Office of Environment and Energy, Washington, D.C. 20591, United States
3. Swiss Federal Office of Civil Aviation, CH-3003 Bern, Switzerland
4. Manchester Metropolitan University, Manchester, M15 6BH, United Kingdom
5. Aerodyne Research, Inc., Billerica, Massachusetts 01821, United States