The Dubai-based carrier's premium economy product is relatively new.

Airline cabin classes like premium economy, business, and first class can be confusing and vary significantly between domestic and international flights. On most U.S. domestic flights, "first class" ...

It seems to be one of the use of space aboard aircraft for maximizing revenue.

A closer look at the true cost of upgrading to premium economy on major US carriers.

Add Yahoo as a preferred source to see more of our stories on Google. Don't get tricked next time you pay for an airline upgrade, because you might not be getting what you expect. Here's what I mean.