Boarded the flight from Oslo went to Longyearbyen via Tromso. We had to leave plane in Tromso, wait abiut 20 minutes and then reboard. There was only a couple of toilets near the gate so most of that 20 minutes was spent lining up to use them! Eventually we boarded the flight and after they worked out a problem with an "extra passenger" on board we were on our way to Longyearbyen.