American Airlines is offering its pilots 150 percent of their hourly pay to work during the holidays after a glitch allowed too many pilots to take vacation at the same time. Due to an error in the system pilots use to bid for time off, thousands of flights during the holiday season currently do not have pilots assigned to fly them. The union estimates some 15,000 flights next month don't have pilots assigned to fly them. "The airline is a 24/7 op," said Dennis Tajer, an American Airlines captain and a spokesman for the pilot's union. "The system went from responsibly scheduling everybody to becoming Santa Claus to everyone. The computer said, 'Hey ya'll. You want the days off? You got it.'"