A 79-year-old woman has been released from custody after she was removed from a flight at Shannon Airport and arrested over an alleged air rage incident.

It is understood that the woman became disruptive on board the transatlantic plane, that was en route from Frankfurt in Germany to Toronto in Canada.

The Boeing 777-300 jet was over 1,000km north-west of Shannon when the crew opted to turn around.

It is understood she had to be restrained by members of the cabin crew, at least one of whom is reported to have been scratched.