There's a good reason JetBlue has become the 5th largest airline in the United States. It started in 1999 with the radical idea that flying shouldn't have to cost an arm and a leg. JetBlue cut out some of the over-the-top frills, focusing on safety and customer service to keep fares as low as possible. Today, they fly to destinations around the U.S., plus sought-after locales like Puerto Rico, The Bahamas, Jamaica and Mexico. In addition, their rewards program is considered one of the best in the industry, making them one of those rare companies that garners loyal customers.