Lulutai Airline's 19-seater DHC-6 Twin Otter will service the Vava'u and Ha'apai routes over the Christmas holidays, while the other two aircraft in its domestic fleet are out of service. The PM Hon. Hu'akavameiliku said today, that the Civil Aviation Authority of the Ministry of Infrastructure is investigating the incident with the Saab 340 aircraft, last Friday 8 December.