Miami's terminal radar approach control center, or Tracon, guides airplanes from high altitude into airport approach paths and then hands them over to airport control towers.

WSJ: Airlines Dispute Planned Air-Controller Cuts

Mr. Marinitti, the Miami Tracon controller, said furloughs are going to reduce the Miami Tracon staff during its busy shifts, to 14 controllers from 18, while two of those controllers will have to monitor three small airports that will likely lose their towers to cuts.

WSJ: Airlines Dispute Planned Air-Controller Cuts