Convair CV-580s. Partnair used the aircraft to fly domestic charter for oil companies, mostly to Andøya Airport, Andenes, as well as larger corporate groups internationally. Nor-Fly had bought the two aircraft in 1980 and 1981, respectively; one was based at Fornebu and the other at Stavanger Airport, Sola. With the merger, Partnair relocated both aircraft to Stavanger. Maintenance on the Convairs was subcontracted to Fred. Olsen Airtransport. A new hangar and office building was completed at Oslo Airport, Fornebu in May 1985, having cost 15 million Norwegian kroner. The hangar measured while there was of office space. At the time the airline had 75 employees. The company stated that the merger had allowed it to operate better in two separate market sizes and was able to better sustain the volatility in the air taxi market. About half the company's revenue came from each size of aircraft. In September 1985 Partnair started talks with Norving with the aim of a merger, but the talks never led to anything. A third Convair 580 was bought in May 1986. In the second half of 1984 the airline developed plans to start scheduled traffic, and applied for concession to operate out of Sandefjord Airport, Torp to Gothenburg and Copenhagen. They also applied to operate a route from Oslo via Notodden Airport, Tuven to Stavanger. The Notodden concession was granted in March 1985, and the route was started on 15 August using Super King Air and flew twice a day, five days a week. This route was made possible after an instrument landing system was installed at the airport. The upgrades also included a new terminal. Ticket sales and check-in was managed by NSB Reisebyrå, a subsidiary of the Norwegian State Railways. After five months, Partnair had lost 1.2 million kroner on the route. In average, they were selling three to four tickets per flight to Stavanger, and one to Oslo. From March 1986, the leg from Notodden to Oslo was dropped and the service to Stavanger reduced. However, the route proved unprofitable and was eventually terminated later the same month. The company had a deficit of 6.5 million kroner in 1986. After having lost 10 million kroner of its investment, Tenvig decided to withdraw from the airline and closed it down in April 1987. However, seventy percent of the company was bought by Helikopter Service. The airline started operations again in August, legally as