The company reported it.
http://www.sec.gov/A...p73523e10vk.htm
Despite high fuel costs throughout the year, the airline industry is expected to report an annual profit in 2006, excluding special items and bankruptcy-related costs, for the first time since the terrorist attacks on September 11, 2001. While the industry continued to focus on structural changes through cost containment and fleet rationalization, airlines were able to pass some of the fuel price cost increase on to passengers through higher fares.
http://www.sec.gov/A...p72019e10vk.htm
Fares remained at or near historically low levels,
although the rising cost of fuel did lead to increased fares toward the latter part of 2005. Whether demand can remain at historically high levels in the face of rising fares is unclear, but as domestic capacity continues to rationalize through fleet reductions and the redeployment of aircraft to international markets, the likelihood of further fare restructurings such as Delta Air Lines’ Simplifare program, a pricing scheme introduced in January 2005 that generally lowered fares significantly and reduced restrictions on discount fares, seems to be diminishing.