Hahaha, that strikes me as funny for some reason; they just happened to have this weird MD-80 lying around DFW they gave to that flight crew. Never seen it before.
I don't know when the jets go in for Heavy C checks but I'm guessing it'll get its power port wiring set up when it does. Did you happen to catch the jet's registration number? Just curious.
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Best regards,
Dairenn Lombard
Los Angeles, CA