By Lilit Marcus, CNN

Photo: AFP/ROLAND WEIHRAUCH

Writer Amelia Mularz was on a Chicago-to-Los Angeles redeye earlier this year when a very drunk passenger plopped into the seat next to hers.

As the plane pulled back from the gate, the man ran to the bathroom and, she says, threw up so much that a cleaning crew had to be called in from the airport. The passenger was then removed from the flight and the plane took off an hour late.

But Mularz is far from being the only passenger who has been a first-hand witness to bad plane behaviour.

When University of Texas at Dallas criminology professor Lynne M. Vieraitis analysed years' worth of in-flight passenger incident reports, she found one common theme.

"Alcohol. Alcohol. Alcohol."

Vieraitis and her colleague Sheryl Skaggs went through 1600 complaints filed with the Aviation Safety Reporting System, breaking down reports about misbehaving passengers into categories such as verbal abuse, physical violence and sexual harassment.

"People getting into fights, people arguing with each other, not putting luggage away, not listening to directions - alcohol. Sexual assault and harassment - alcohol.

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