Great timing Eswube!
From me, some small cosmethic changes to the DC-9 and MD-80 families:
Modified the thrust reversers on the DC-9-50, which are rotated 17° inwards compared to the previous models. Also added the fins below the cockpit windows, another exclusive feature of the -50s over the other DC-9s.
Replaced the MD-81/82/83/87/88 engines with the P&W JT8D-200 series (they all still featured the earlier JT8D of the Dc-9s).
Overall, I don't think this mall work warrants a change in the credit lines, which have been left as they were.