The world's largest airport terminal is one of a host of projects, including stadiums and office towers, Beijing has built for the Olympics to show off China's economic prowess.

His boy had run ahead of him and climbed high on to a nearby cement factory tower.

But we just sat on the runway due to a problem in the control tower.

"This is nothing new," said Bob Richards, a retired air traffic controller who worked at Chicago's O'Hare International Airport for 22 years and wrote the book "Secrets From the Tower."

The Design idea and Computer Image Generation(CIG)technique of a low-cost Air Traffic Control(ATC)Tower Simulator based on networked microcomputers are proposed.