Context: Ground Control is responsible for directing all ground traffic in designated "movement areas", except the traffic on runways. This includes planes, baggage trains, snowplows, grass cutters, fuel trucks, stair trucks, airline food trucks, conveyor belt vehicles and other vehicles. Ground Control will instruct these vehicles on which taxiways to use, which runway they will use (in the case of planes), where they will park, and when it is safe to cross runways. When a plane is ready to takeoff it will stop short of the runway, at which point it will be turned over to Tower Control. After a plane has landed, it will depart the runway and be returned to Ground Control.

Question: What is responsible for directing all ground traffic in designated areas?
Answer: Ground Control

Question: Who instructs vehicles on which taxiways to use?
Answer: Ground Control

Question: When a plane is ready to take off, who takes over the direction of a plane?
Answer: Tower Control

Question: When is control turned back over to ground control?
Answer: After a plane has landed

Question: What are stair trucks responsible for?
Answer: Unanswerable

Question: What are two things Ground Control instructs Tower Control to do?
Answer: Unanswerable

Question: When a plane is ready to take off what does it do before being turned over to Ground Control?
Answer: Unanswerable

Question: When a plane lands what does it do before returning to Tower Control?
Answer: Unanswerable

Question: What are some examples of ground traffic Tower Control directs in designated areas?
Answer: Unanswerable