In GW #1, I had a base at ZPPP. The airport recently closed, and my base naturally moved to the new airport, ZPPK. However, when this move happened, the airport suffered a significant drop in demand on many of my routes. I had only 46 aircraft there and still lost ~45K weekly passengers when the move happened. I now have oversupply warnings on 40 routes, some of which had demands drop from around 150, (I do not have exact figures on previous demands) to 50 daily pax.
As far as I understand, no other airport was opened around Kunming that would affect the demand. Does this mean that 45K people who previously came and went from Kunming changed there plans because a new airport built? The airport is just as large as the old one, and many demands remained the same, why did these fall? Can this be fixed?