Nashville International Airport's air traffic control tower is severely understaffed, and it is extensively reliant on out-of-date control systems. Nashville International Airport Time Zone America/Chicago IATA Code BNA City Nashville Country United States Designation Major-Domestic ICAO Code KBNA State/Prov./Reg. The margin of error lowers as traffic increases, and lower staffing levels in air traffic control towers are undeniably a major cause for concern. One of the biggest issues with air traffic control as a profession is that it offers an extremely stressful workplace environment, but without lucrative financial compensation. Thus, many young professionals in the field are being pushed away from the years of training that are typically required to become an air traffic control tower operator.