South Africa’s government and national airline are being sued by a little-known investment firm, which wants the sale of a majority stake in the carrier scrapped and re-run due to a lack of transparency. This year’s acquisition of 51% of South African Airways by the Takatso Consortium — made up of a local jet-leasing company and a private-equity firm — for just $3 was “unlawful and constitutionally invalid,” according to documents filed at the High Court in Cape Town by Toto Investment Holdings.