From 5W Infographics, a breakdown of how the bargain basement carriers do it:

AUTHOR
Mick Weinstein
Mick is the Head of Editorial for Covestor, a financial journalist and online content specialist. Prior to joining Covestor, Mick was for five years the Editor in Chief and VP Content at stock market analysis website Seeking Alpha, where he built the editorial function as the site attracted over 3.5 million unique monthly visitors and developed an innovative platform for intelligent stock market discussion. Mick is a graduate of the University of Michigan, Ann Arbor.
380 posts You may also like
At Business Insider, Joe Weisenthal published an remarkable graphic originally from Stifel Nicolaus. It shows equities and commodities over the last 140 […]
Supply gluts in the commodities world spell trouble ahead.
M&A deals are expanding worldwide. Here’s how to play it.
ECB chief Mario Draghi’s announced bailout plan this week is not a cure-all for the European debt crisis, but it has real substance.