Ever felt agitated while flying? You can probably blame the first-class fliers.
Researchers at the University of Toronto and Harvard Business School suggest that air rage during flights is often caused by inequality on airplanes.
The report, which was published online, says planes that have a designated first-class cabin are almost four times more likely to have an onboard incident than planes that do not offer class seating.
The researchers note that the increased potential for air rage caused by the presence of first class is level with that of passengers who endured more than a nine hours of flight delay.