In this Sept. 8, 2015, photo, a United Airlines passenger plane lands at Newark Liberty International Airport in Newark, N.J. Twitter users are poking fun at United's tactics in having a man removed from an overbooked Chicago to Louisville flight on April 9, 2017.
In this Sept. 8, 2015, photo, a United Airlines passenger plane lands at Newark Liberty International Airport in Newark, N.J. Twitter users are poking fun at United's tactics in having a man removed from an overbooked Chicago to Louisville flight on April 9, 2017. Mel Evans Associated Press
In this Sept. 8, 2015, photo, a United Airlines passenger plane lands at Newark Liberty International Airport in Newark, N.J. Twitter users are poking fun at United's tactics in having a man removed from an overbooked Chicago to Louisville flight on April 9, 2017. Mel Evans Associated Press

Airlines often oversell flights, end up bumping passengers

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