rastos1 writes: Airlines worldwide were forced to delay flights Thursday as a global flight-bookings system operated by Amadeus IT Group SA suffered what the company called a "network issue." Major carriers including British Airways, Deutsche Lufthansa AG, Cathay Pacific Airways and Qantas Airways were among those reportedly impacted by the outage. Singapore's Changi airport said via Twitter that a technical issue affecting some operators was delaying the check-in process, with boarding passes having to be issued manually. "Amadeus confirms that, during the morning, we experienced a network issue that caused disruption to some of our systems," the Madrid-based company said in a statement. Technical teams took immediate action to identify the cause of the issue and services are "gradually being restored," it said.