The Viscount entered revenue service on 2 April 1968 on the Blantyre to Johannesburg route, and later routes included Blantyre-Salisbury, and Salisbury-Mauritius via Blantyre and Nampula. The late 1960s and early 1970s saw the fleet being modernised and standardised. Two HS-748s were ordered in May 1969, and the airline ordered two Britten-Norman BN-2A Islanders in July 1969. The HS-748s were delivered in December 1969 and January 1970, and the Islanders were delivered in November 1969 and September 1970, allowing for the sale of the Beech Barons. The airline disposed of the last of the DC-3s in March 1970, and in November 1970 it leased a BAC One-Eleven from Zambia Airways on a two-year term. With the addition of the BAC One-Eleven, Nairobi and Johannesburg were added to the fleet network.