American Airlines is the world's largest airline when measured by fleet size, revenue, scheduled passengers carried, scheduled passenger-kilometers flown, and number of destinations served. David Bell serves as the Managing Director of Cybersecurity & Technology Risk Management, CISO, at American Airlines. He previously served as the company's Managing Director of Enterprise Infrastructure Services, a position he assumed in April 2013, shortly before the merger, after serving since May 2012 as Senior Manager of Platform Hosting Services. Bell joined American Airlines in April 2007 as Senior Manager, Information Systems Security, after nearly six years as Associate Director at consultancies Arthur Andersen and then Protiviti.