Nearly 30 million people fly through Washington Dulles airport every year, on the doorstep of the US capital. Most of those flyers will enter and exit through its main terminal. But the operators of the airport spotted an opportunity to better service the more well-heeled traveller. The Metropolitan Washington Airports Authority (MWAA) set about opening a new luxury private terminal at Dulles airport that would include separate security and customs clearance, replete with extravagant features and entertainment for someone willing to spend a couple of extra grand on their flight experience. There are dozens of these types of terminals around…