United Airlines flight 4166 — from Pennsylvania to Chicago — made an emergency descent after rapidly losing cabin pressure 40,000 feet above Ohio.
The plane left the Lehigh Valley International Airport in Allentown, Pennsylvania, around 5:24 a.m. and was expected to arrive at Chicago's O'Hare International Airport at 8:44 a.m.
The Federal Aviation Administration is once again looking into a close call at a major U.S. airport, after two passenger jets narrowly avoided a mid-air collision as they attempted to land in Phoenix.
A United Airlines flight Sunday from Lehigh Valley International Airport to Chicago was diverted to Detroit because of a possible problem with the cabin pressure.
The FAA has begun an investigation into a midair incident involving a United Airlines Boeing 737-900ER and a Delta Air Lines Airbus A330-300.
The United Airlines flight was forced into a sharp fall after experiencing a sudden fault at 40,000ft prompting an urgent call to air traffic control
Passengers on a United Airlines flight from Allentown, Pennsylvania, to Chicago were diverted to Detroit Metropolitan-Wayne County Airport after their plane lost cabin pressure at 40,000 feet.