Airlines operating at OR Tambo International Airport in Johannesburg are experiencing significant delays on Monday as a result of refuelling challenges.“Please be advised that due to refuelling challenges at OR Tambo International Airport airlines are unable to refuel aircraft as normal. As a result, some flights may experience delays,” the Airports Company South Africa (Acsa) said in a statement posted on its X page.“We understand the inconvenience this may cause and technicians are working to resolve the situation as quickly as possible. We will keep passengers informed of…