I would like to thank Tom Rogers, of the Sophron Foundation and Space Transportation Association, for both suggesting and funding the project that resulted in this report, his many useful suggestions for its improvement as it developed, and for his remarkable forebearance in awaiting it these many months. Hopefully, it will prove to have been worth the wait. Discussions with Dr. Antonio Elias of Orbital Sciences corporation were helpful in evaluating the potential of the X-34, as were telephone discussions with personnel at NASA Dryden Flight Research Center on issues pertaining to civilian use of the SR-71. I also greatly appreciate reviews and constructive comments from Jeff Greason, Henry Spencer, Gary Hudson, and Jim Bennett.

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