All roads lead to Greensboro (well, at least I-40, I-85, and I-73).
Greensboro is served by Allegiant, American, Delta, and United Airlines at the Piedmont Triad International Airport (GSO). The National Congress location is a little over an hour drive from Raleigh-Durham International Airport (RDU) via I-40, and an hour and a half from Charlotte Douglas International Airport (CLT) via I-85.