India, July 13 -- A United Airlines flight travelling from Rome to Newark had to divert to Ireland after the crew noticed problems with one of the plane's engines mid-flight.

United Airlines flight 509 took off from Rome Fiumicino "Leonardo da Vinci" Airport at 1:36pm local time on Saturday, July 11, as per FlightAware.

The plane, a 24-year-old Boeing 767-400, was supposed to land at Newark Liberty International Airport in New Jersey nearly 10 hours later.

About three hours after takeoff, the aircraft changed course over the Atlantic Ocean and headed to Shannon Airport in Ireland, according to flight records.

As per Aviation Herald, that the pilots noticed vibrations in the aircraft's right engine. They also reported an unusual smell ...