Many aircraft also have satellite phones that controllers can call.
WSJ: How New Air-Traffic Control Systems Operate Over Oceans
Low cost airlines like easyJet, Ryanair and Go are buying new aircraft and adding new flights faster than controllers can be found to handle them.
Radar, or radio waves, sweep the sky every 12 seconds transmitting images of approaching aircraft that can then be viewed by controllers onscreen in a series of centers spanning the nation.
When storms hit or congestion surfaces, controllers respond by increasing spacing between aircraft, leading to delays and flight cancellations.
Aircraft equipped with ADS-B are able to automatically send highly precise data, such as aircraft positioning and speed, to air traffic controllers every second.
With permission from air-traffic controllers who are monitoring any other aircraft in the area, it's not dangerous for pilots to divert from prescribed navigation paths.
Delays happen because air-traffic controllers need to leave a safety margin between aircraft as they take off.
Davis said it's time to do away with the old fashioned paper-and-pencil flight strip markings that controllers in towers have been using to track aircraft for decades.
Planes operated under visual flight rules -- rules that require only limited contact with air traffic controllers -- were grounded along with commercial aircraft in the hours immediately following the hijackings.
"We saw a drone, a drone aircraft, " the pilot can be heard telling air traffic controllers on radio calls captured by the website LiveATC.net.
"Previously if aircraft wanted to climb or reroute, it was a tedious process and controllers often didn't have time, " said Dennis Addison, support manager for FAA's Oakland center.
WSJ: How New Air-Traffic Control Systems Operate Over Oceans
Controllers, standing on the side of the deck, observe incoming aircraft with less-than-seasoned pilots and must quickly decide whether a plane should be allowed to land or be waved off.
The aircraft's transponder, which identifies the plane and relays details such as altitude and speed to controllers, stopped transmitting.
Controllers generally guide planes on runways and active taxiways, but it would be unusual for them to discuss aircraft that are in parking areas with pilots who are taxiing past them.
应用推荐