Tum teh tum ... it's here somewhere ... ummmmm ... Yep, got it - a can of worms! Now then, can opener, and here we go!
Let's have some considered opinions from the TechLog pundits on this; and just in case you think it's written by cranks - the authors are David Anderson, Fermi National Accelerator Laboratory, and Scott Eberhardt, formerly of the Department of Aeronautics and Astronautics, University of Washington, now at the Boeing Company.
http://www.allstar.fiu.edu/AERO/airflylvl3.htm