Reprinted from nbcnews.com. By Jacquellena Carrero.

A Chicago-bound United Express flight was diverted to Indianapolis after a 10,000-foot vertical drop.

United Express Flight 5919 was headed from Charlotte, North Carolina, to Illinois when it suddenly plummeted and was diverted to Indianapolis International Airport shortly after 8 a.m. Sunday morning, officials said.

The Indianapolis Airport Authority indicated the plane dropped 10,000 feet mid-flight, but a spokesman for ExpressJet, which operates United Express, said there was a “pressurization issue” on board and could not confirm just how far the plane dropped.

Airline spokesman Jarek Beem noted that it is standard procedure for planes to drop to a 10,000 foot altitude when there is a pressure issue on board.

According to Jeff Dutton, Communications Manager at Indianapolis Airport Authority, passengers were checked out once the flight landed but no one was taken to a hospital.

“Some passengers were complaining of headaches and ear problems so they diverted to Indianapolis,” Dutton said.

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