After analyzing data on “disruptive passenger incidents” from an airline company’s database of millions of domestic and international airline flights, researchers found that flights with a first-class section were nearly four times more likely to have air rage incidents in their economy class, and that these incidents of “belligerent behavior” or “emotional outbursts” became nearly 12 times more likely among first-class passengers and more than twice as likely among economy-class passengers if people were made to board from the front of the plane and walk through the first-class section together.