Airwaves granted to telecom operator Aircel could be cancelled if two executives at Malaysian parent Maxis Bhd do not appear at a trial court, the Supreme Court warned on Friday. The court, led by Chief Justice JS Khehar, also barred Aircel from transferring the ownership of its airwaves while a corruption case centred on a past deal involving the mobile phone carrier was under trial, potentially delaying an agreed merger. The court has given the company two weeks to respond.