The term 'BIG AIRPORT' can be broken down into two crossword solutions: HUB (3 letters) and DULLES (6 letters). A HUB is an airport where many airlines operate, allowing passengers to easily transfer between flights. Dulles International Airport is a large airport located in Virginia, serving the Washington, D.C. metropolitan area. It is one of the busiest airports in the United States, handling over 25 million passengers annually.