Air Traffic and Navigation Services (ATNS) confirmed today that it is in negotiations over non-payment of services with a domestic airline. This comes as Skywise is cancelling flights. “Dear travellers‚ flights S8 101 & S8 102 have been cancelled. We’re working on alternative flights to accommodate everyone as best we can. We will keep you updated as soon as there are any developments. Please accept our sincerest apologies for the inconvenience‚” the airline said on its Twitter feed this morning.ATNS Percy Morokane‚ asked for comment‚ said in a statement he could confirm “that one of the airlines operating in our airspace has been momentarily grounded on Saturday for non-payment of Air Traffic Services (ATS). However they were back on air by midday on Sunday after consultations between the two parties (ATNS and Skywise). Negotiations are ongoing”.He added: “We're not at liberty to discuss further details as this such will jeopardise our business relationship with the airline in question. All airlines operating in our airspace are aware of our terms and conditions regarding our service offerings especially those relating to ATS”.J. Malik‚ one of the managing Skywise directors contacted by telephone‚ said he could not answer questions about the lack of payment to Air Traffic and Navigation Services straight away. “We are possibly going to have a press conference or reply in a press statement to everyone at once‚” he said.Cape Town flyer Ayanda Melansi @Ayanda–Melansi questioned the airline on Twitter this morning‚ asking: “@SkywiseAirline Do we know why your first flight for today was grounded? I’m getting conflicting responses”. The airline‚ in reply‚ apologised and stated: “We’ll be posting more updates as soon as we can”.On its Facebook page‚ consumer Dane Becker asked the airline: "Could you please elaborate as to why the flights were cancelled. Do any ticket holders need to be worried for any future flights being cancelled??"There was no immediate response to his query.The airline’s problems began to affect flyers on Sunday‚ when Skywise wrote this post on its Facebook page: “We experienced an unexpected technical fault this morning‚ hence the disruptions we are experiencing. The only flights affected were 105 & 112 the rest of the flights are expected to operate on schedule. Please accept our sincere apologies for the inconvenience suffered. We will keep you updated should there be further developments”.Disgruntled passengers took to Twitter‚ with Rasthoem Simons @simsport tweeting: “@SkywiseAirline not even your staff knows whats happening anymore.So much for changing face of airline service in SA”. In response to the airline’s apology‚ he wrote: “Would just like my refund for BA flight I had to book processed asap”.Another passenger‚ Jullieta lum @jenonel1 tweeted: “Also had to buy BA tickets over R6000. Refund?”This is the second disruption to air travel in South Africa this month. Last week‚ The Times reported that a failure of control-tower equipment at Johannesburg’s OR Tambo International Airport left dozens of planes grounded. ATNS confirmed the failure of radio equipment‚ saying a technical malfunction had interrupted communication between air traffic controllers and crew on planes at the airport and in the surrounding airspace...