As one of the largest airlines in the world, American Airlines can fly you to almost every corner of the globe. Its major hubs lie in St. Louis, Miami, San Juan, Chicago O'Hare and Dallas/Fort Worth, which is its largest. Its 170+ destinations will fly you to Western Europe, Japan, Latin America, India and Canada. Although there is some debate as to which airline was the first to provide onboard flight attendants, American Airlines holds claim to being the company featured on the flight attendant Barbie. More importantly, this airline was also one of the very first to provide its customers with a frequent flyer program, the AAdvantage.