AP
A United Airlines Boeing 787-8 Dreamliner.
According to ABC News, the first officer became unconscious during the morning flight, forcing the aircraft to divert to Albuquerque.
The flight landed safely, and the co-pilot is reported to be in stable condition.
"United flight 1614, from Houston to San Francisco, diverted to Albuquerque this morning when a crew member became ill," a United Airlines spokesperson told Business Insider via email.
"The aircraft landed safely. We're working to get the customers to their final destinations."
According to flight-tracking website Flightaware.com, the aircraft operating as Flight 1614 was a Boeing 787-8 Dreamliner.
This incident comes a day after the death of an American Airlines captain during a flight from Phoenix to Boston. That flight diverted safely to Syracuse, New York with the first officer at the controls.