It goes without saying that airports and airlines are critical to the U.S. transportation system and to the broader national infrastructure, of which air transport plays a vital role. Even in less unsettled times, the nation’s commercial air transportation system is daily presented with a variety of threats coming from many different directions. The skill with which such threats are handled by the security apparatus protecting it all is impressive, especially when we consider the scope and scale of U.S. commercial aviation. Air travel and transportation is a gargantuan activity, with its direct sectors (i.e., airports and airlines) contributing 2.8 percent of U.S. Gross Domestic Product, or $850 billion in 2019 alone.