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Modern airports rely on tightly —coordinatedcoordinatingcoordinatecoordination schedules to move aircraft, baggage and passengers through a single facility without gridlock. A delay on one runway can quickly —rippleripplingrippledripples through connecting flights across an entire network. Ground staff therefore track each aircraft's turnaround time to the —minuteminutesminutelyminuted, since even a few spare minutes can be the difference between an on-time departure and a missed —slotslotsslottingslotted.