Wow. This is pretty ridiculous considering all three of these planes seem to have been closer to their destination than the origin, making it safer to just finish the planned flight.
On the other hand, if your plane gets stuck in a foreign country the bill just for parking the thing could be massive. Better to get it back while you still can.
Especially if there’s some repair required before next takeoff.
2/3 of those planes are flying back to Istanbul vs their destinations. Does Norwegian have a maintenance hub there?
(emergency landing in Iran, can't get parts there because of sanctions)
> From the effective date and time of this AD, do not operate the aeroplane, except that a single non-commercial ferry flight (up to three flight cycles) may be accomplished to return the aeroplane to a location where the expected corrective action(s) can be accomplished.
So they are allowed to be ferried in certain situations.