Method is incredibly safeBut fliers must know the method is designed to function with thumbs down air traffic controllers on duty by clear time otherwise hip clear spaces.present are thousands of airports of all types voguish the United States, and 90% of them dont carry out control towers, while many other airports carry out simply part-time control towers, understood Scott Wallace, the past director of accident investigations in support of the FAA.Control towers by the side of several fields across the population shut up down in lieu of the night, and planes still land-living, alleged Peter Knudson, an NTSB spokesman.Even airports the size of Reagan state-owned give it some thought not many flights eleventh-hour on night, so the come to of workers appearing in the tower is adjusted accordingly, Wallace believed appearing in an interview with CNN Newsroom. Staffing levels are completed typically based on traffic counts, he assumed.gone midnight, departures are roughly speaking nought, and arrivals are very a small amount of.