In advance of a major site revamp, Raleigh-Durham International Airport is increasing its profit coffers in virtually every category, from terminals to parking.

Thursday, the airport reported a 21 percent year-over-year net income uptick at $68.5 million, with a whopping 1,036 days-worth of cash on hand. In terms of days, it’s a war chest that nearly doubles the peer average, 556 days worth of cash. The numbers show RDU is bulking up for the infrastructure improvements it will be paying for in…