When asked how they identify their social class 54% of Americans said they belong to the middle class, according to one survey.

Avianca's economy class has several fare types based on whether you need flexibility or want to check a bag. Avianca Airlines flies to more than 100 destinations, including six in the United States.

The middle class is at the center of a shape-changing U.S. economy. Here's what you need to know. What's the shape of the U.S. economy right now? It's an "E," apparently. Forget the K-shaped economy.