Ryanair can be viewed as the "extremist" budget-airline. Although this article may propose a great dichotomy, I think it illustrates the direction for lots of low-cost airlines. Ryanair is controversial and has a business model that is being duplicated across the world. Even Southwest created a pledge in 2012 to drastically increase ancillary revenue.
Venezuela, Iran and Egypt also have massive currency Black Markets due to similar troubling economic and political undercurrents. Some of Argentina's figures are very surprising!