One of Southwest Airlines' many special liveries, this one featuring the New Mexico One, with New Mexicos flag design on it. The registration of this aircraft is N781WN.
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)
Enjoy!