![](https://blogs.sas.com/content/sastraining/files/2017/04/airline_denied_boarding_rate_2016-1.png)
You've probably all seen the images of the passenger being forcibly removed from a United Airlines flight, to make room for airline staff flying on standby. The incident caused quite a bit of negative publicity, and quickly wiped out a quarter billion $ of the airline's market value. But did