One of Southwest Airlines' many special liveries, this one featuring "Triple Crown One". "Originally introduced on June 9, 1997, Triple Crown One was dedicated to the Employees of Southwest Airlines responsible for achieving five annual “Triple Crowns” for number one in ontime performance, baggage handling, and Customer Service (based on DOT reports from 1992-1996)" copied from Southwest's website. The registration of this aircraft is N409WN.
To install simply open the .RAR file, extract the .ptp file of the livery to a folder or desktop of your choice, open the PMDG Operations Centre, Aircraft and Liveries tab on the top, livery utilities and then "Install from PTP file".
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(Pictures provided may not represent the final product, nose cone is now darker than images show.)
Enjoy!