<http://schema.org/url>
<http://www.businessweek.com/articles/2013-12-11/delta-american-and-united-just-raised-prices-dot-what-will-southwest-do>
<http://www.bloomberg.com/bw/articles/2013-12-11/delta-american-and-united-just-raised-prices-dot-what-will-southwest-do>