The Airbus A320 was flying from Liverpool to Naples when it diverted and landed at about 7.20am.
An airline spokesman said the aircraft, which had left Liverpool at 6.40am, landed safely and passengers “remained calm”.
“At no point was the safety of passengers threatened,” he told the BBC.
“We now want to make sure we get the passengers to Naples as quickly as possible.
“Meanwhile, the plane is being inspected.”
Sourced from Travel Weekly