update (28 October 2019): Air Zimbabwe and the Airports Company of South Africa (ACSA) have agreed on a payment plan. As a result of the negotiations, Air Zimbabwe's Boeing 767-200, which had been impounded by ACSA over the debt, has been released and the airline resumed its flights to South Africa.
Airports Company South Africa (ACSA) has confirmed that it has suspended Air Zimbabwe from using its nine airports in South Africa with effect from 22 October 2019 because the airline owes ACSA payments for landing fees, parking fees and the passenger service charge for its weekly flights. According to a statement by ACSA, the prohibition will remain in place until outstanding amounts are settled. As a matter of fact, Air Zimbabwe's only operational aircraft at present, a Boeing 767-200, has been impounded by ACSA at OR Tambo International Airport (JNB) in Johannesburg since 23 October 2019. We'll keep you posted!