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Please see the official X‑Plane Support page for help.
I am not from Laminar Research; just a flight simmer from down under.
The B727-100 aircraft is not part of the standard list of aircraft supplied with XP11. You have to purchase the aircraft from a 3rd party. Generally these 3rd party aircraft have quite a few additional liveries included in the package. If these extras meet your requirements then good luck. If not, try running the aircfaft through Plane Maker which is supplied with the X-Plane software.
To install additional aircraft into XP11 the have a look at the following link found at https://www.youtube.com/watch?v=V4RjIxrhkXs .Disregard the first part of the YouTube video and concentrate on the process in the second half.
This site is no longer being actively maintained.