Landing gear problems have forced a United Airlines flight to make an emergency landing at Newark Liberty International Airport, AP reported. No injuries were reported with the landing at around 9:30 a.m. Sunday. The Port Authority of New York and New Jersey, which operates the airport, said all 53 people aboard Flight 634 from Chicago got off the plane safely. Officials say the plane"s landing gear apparently failed to deploy properly. It was not yet clear why that happened. The incident caused delays of about an hour for departing flights.