Hold Short

You are the tower. Jets land on 9L, take off from 9R and cross 9R to reach the gates. Nobody moves onto a runway without your word. One wrong word and two airplanes meet.

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Safety-net hints (buttons turn red when unsafe) Radio voices

How the tower works

Arrivals call in at 8 miles. Press L to clear them to land. No clearance by 0.3 miles and they go around.
The runway must be empty when an arrival crosses the threshold. You may clear it early, expecting the runway to empty. If it doesn't, press G to send it around before it gets there.
Crossings: after landing on 9L, jets hold short of 9R at X1 or X2. Press X to cross. Never cross in front of a departure that is rolling or cleared to roll.
Departures hold short at A1 (full length) or A3 (intersection). W lines them up and makes them wait. T clears them for takeoff.
Takeoff spacing: the jet ahead must be airborne and 6,000 ft down the runway. Behind a heavy, wait 2 minutes; behind an A380, wait 3. Add 1 minute from an intersection.
Sidestep (S): move an arrival from 9L to 9R when 9L is jammed. It exits south with no crossing, but it uses your departure runway.
H holds an aircraft that hasn't entered the runway yet, or cancels a takeoff clearance before the roll.
Scoring: +50 for each landing and departure, −40 for each go-around, −1 for every 3 seconds anyone waits more than 90 s. A runway incident costs 300 points. Three incidents and you are relieved. A collision ends the shift.

Hold Short

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