Skinpack of United States' 4x domestic airlines in 1970-1980s for B727 in Civil Aircraft Mod.
Hughes Airwest , PSA , Republic and Western.
Those liveries were seen at McCarran International Airport / Las Vegas.
This skinpack needs "Boeing 727 Common Normal map / RoughMet Textures pack Rev3" from here. --- https://www.digitalcombatsimulator.com/en/files/3318369/
When you see strange checker blocks on the skins in DCS World, the "Boeing 727 Common Normal map / RoughMet Textures pack Rev3" is not installed / not set-up correctly.