It hasn't been a good week for air travelers.

Over the weekend, a man urinated on a fellow passenger on a flight from New York to Delhi. 

On Monday, authorities arrested a man for trying to stab a flight attendant in the neck with a broken metal spoon on a flight from Los Angeles to Boston.

A few days later, a passenger on a flight from Dallas to Phoenix viciously attacked another passenger because he had "bumped" his wife, according to reports.

What's going on?

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