Air controller Tyler Casper controls the taxi ways from the 150-foot control tower in 2008. Last week’s mid-air collision highlighted the air traffic controller shortage but FAA documents show Sacramento’s staffing is above its “staffing standards target.”

Since the midair crash in Washington, D.C., there have been questions about air traffic controller staffing. According to the latest FAA data available, more than 90% of air traffic control towers are understaffed.