Vietnam has started operating a new $900 million airport terminal that will nearly double the capital's flight capacity, the latest move in expanding what is one of the world's fastest-growing aviation markets, Reuters reported. Passenger planes took off on Thursday from Noi Bai terminal two, Hanoi airport's new wing that will handle 10 million passengers per year and up to 15 million in future as demand rises for air travel at home and abroad. Noi Bai has been overstretched for years with only one terminal and capacity of 12 million annual passengers. The new terminal formally opens on Dec. 31. Foreign arrivals in Vietnam rose more than 10 percent last year to 7.6 million, government data showed, while domestic demand is climbing amid rapid middle class growth and competition between airlines.