A Jet2 plane has made two emergency landings in as many weeks.
The aircraft was flying from Ibiza to Leeds when it was diverted to Barcelona on July 16.
On Friday, it was diverted to Frankfurt during a flight from Newcastle to Prague.
A spokesman for the airline insisted passenger safety had not been compromised and said the plane had been grounded while engineers investigate a technical fault.
"We would like to emphasise that at no point was the safety of passengers compromised," a Jet2 spokesman said.
"On landing, our crew liaised with everyone on board to ensure their welfare.
"Over the next few days our most senior engineers will be investigating the aircraft fully.
"At this stage it is too early in the process to comment on the cause of the technical fault.
"We would like to apologise to our customers, as safety is always our highest priority."