Burlington, VT is one of the largest markets within 1,200 of Charlotte without nonstops flights. It’s also unique among the larger places without flights in that US Airways current flies there from some of its other hubs. A few months back, Burlington won a federal SCASD grant to attract service on either Delta to Atlanta or US Airways to Charlotte.
Delta has just added a daily Atlanta-Burlington flight come June. I don’t know if this is tied to the SCASD money but if it is, then it would seem to reduce the odds of US Airways starting up Charlotte – Burlington service.