Several flights were grounded at Sydney Airport's domestic terminal today due to a technical fault with an air traffic control system. <br/><br/>Air services Australia said it was working to rectify the issue while managing traffic safely as boards at the airport listed flights as delayed due to ATC radar failure. <br/><br/>Qantas Airways Ltd and Virgin Australia Holdings Ltd were both affected by the problem.<br/> <br/>Hundreds of passengers are expected to face delays as the technical glitch hit during the Monday morning peak travel window and one of the first days of a two-week school vacation period.<br/>