NEW YORK (AP) — Airlines, including Delta Air Lines, continued to struggle to restore operations two days after a faulty software update caused technological havoc worldwide and resulted in several carriers grounding flights. Delta Chief Executive Ed Bastian said in a statement Sunday that flight cancellations continued as the airline tried to recover its systems and restore operations. He noted that the pause in Delta’s operations resulted in more than 3,500 Delta and Delta Connection scrubbed flights. Delta has been offering waivers to affected customers.