There are many things that have contributed to the shutdown. The PIK maintainance came from the Polar purchase. AAWW then decided to use PIK for tech stops for the military and other customers.
Then they discovered Hahn (HHN). Cheaper landing fees, nice facilities, better weather, cheaper/better hotels, and close to RMS, so less cost to limo between the two, vs flights in and out of PIK to get to RMS.