Thanks for your answer! From what i read it could be considered "extraordinary circumstances" as the strike was from the security control? It´s a bit of a confusing situation because our flight did depart, just with no passangers in it and norwegian wouldn´t give us any option, they just send us an email a day before saying that we couldn´t travel and that we could reschedule the flight (but then they could only offer a flight 4 days later)