Wow!  Thanks,  Russell...   "8)

  ...


On 5/23/19, RussellMc <apptechnz@gmail.com> wrote:
> *The interesting question and the short answer*
>
>
> This answer <https://space.stackexchange.com/a/36308/12102> shows N515NA,
> CN/MSN: 19437 <https://www.jetphotos.com/info/737-19437> as an early 737,
> and mentions that it may be the first one.
>
> Was this a special design built for NASA, or perhaps a prototype that
> nobody wanted for commercial use?
>
>
> https://aviation.stackexchange.com/questions/64582/how-did-nasa-langley-e=
nd-up-with-the-first-737
>
>
>
> * The 201 page long answer*
>
>             https://history.nasa.gov/SP-4216.pdf
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