(Monmouth, IL)  --  An Oregon pilot is facing charges following a drug bust at a western Illinois airport.  Authorities say Sean Billingsley was caught unloading a shipment of marijuana at the municipal airport this week.  He was taken into custody after police found 200 pounds of pot, a gun and nearly three-thousand-dollars in cash on the plane.  Billingsley is being held in Warren County on a 250-thousand-dollar bond.