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Numsa has told Eyewitness News it will be challenging Putco's decision to dismiss 105 employees. The bus company fired the workers this week for participating in an unprotected strike.
Eskom says load shedding is being pushed up to stage 4 from 11am until midnight.
Comair suspended its British Airways and Kulula flights earlier this week, citing liquidity problems.
Trade Union Numsa had planned to bring the capital city's A Re Yeng buses to a standtill next week.
South African Civil Aviation Authority spokesperson, Phindiwe Gwebu, said that it was their job to maintain the best safety interests of both passengers and airline staff.