The Supreme Court Tuesday declined to hear Kingfisher Airlines’s plea that the United Bank of India should not have declared it a wilful defaulter without hearing its case. A bench of Justice Anil R. Dave and Justice Uday Umesh Lalit said the petition had become infructuous as the state-run bank had already declared the airline a wilful defaulter.The order can be challenged before the Calcutta High Court, they said. Appearing for the grounded airlines, senior counsel Abhishek Manu Singhvi told the court that they were intimated about the bank’s grievance panel meeting Friday and were given just 72 hours to appear before it.