South African airlines are activating contingency plans after problems at the Natref refinery threatened jet fuel supplies, days after a separate shortage disrupted flights in Namibia. | Business Insider Africa The disruption follows planned maintenance at the Natref refinery in Sasolburg that was compounded by a technical problem, according to FlySafair, South Africa’s largest domestic airline. Bloomberg reported on Wednesday that South Africa’s energy aut... [3763 chars]