You are cleared for instrument landing, two seven left approach.
A full instrument landing is out of the question.
Tom scanned his instrument landing system indicator and the altimeter.
As a result a second beacon was added at North Field helping in instrument landings.
By the following year the airline had made 1,200 routine instrument landings at the often fog-shrouded airport.
The airport was also equipped to handle instrument landings and an apron that is able to accommodate large cargo aircraft.
Airline officials said visibility at the airport at the time of the crash was 600 yards, which is sufficient for an instrument landing.
This was the forerunner of the modern Instrument Landing System used today by aircraft.
He also played a pioneering role in leading the company into computerized navigation, instrument landings and improved flight-safety standards.