The Kvitbjørn disaster occurred on 28 August 1947 when, in heavy fog, the Norwegian Air Lines Short Sandringham flying boat Kvitbjørn, registered LN-IAV, hit the mountain Kvammetinden about 1.5 km north of the village of Lødingen in Lødingen Municipality in Nordland county, Norway. The flying boat crashed en route from Harstad to Bodø, the two stopovers between its origin Tromsø Airport and destination Oslo. All thirty-five people on board (twenty-eight passengers and a crew of seven) perished, making the crash the deadliest in Norwegian aviation at that time.