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.

Interesting point. Southwest Airline's loyalty program relaunched last year, and brought the budget airline $180 million in incremental 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!