2) Look at the aircraft.cfg entries above the one you just added. Then, replace the "x" in the line [fltsim.x] with the number AFTER the number you see in the entry before this one. For example: if the entry before the new one is
3) Drop the texture folder, as is, into your FFX B737-500 folder.
4) Load up flightsim, look under Boeing-->737-500, and enjoy the flight!
These files are for the FREE use and enjoyment of the flight simulation community, so please do not sell them for any purpose. You may use the textures in any manner you wish as long as you acknowledge where they came from. The wing, tail, and engine textures are by Erick Cantu of FFX. Thanks to him for sharing the textures and the incredible model with all of us.