The disclaimer from Bloomberg on the list states the following:
Public airlines with market capitalizations of at least $1 billion were considered. Air France and KLM were ranked separately, as were Avianca and Taca. Each pair of airlines operates under the same company. Averages included both passenger and cargo planes, except for Singapore Airlines and Lufthansa, which included only passenger planes. Although AMR Corp. had a market cap of $510 million as of December 31, 2012, and wasn't included, American Airlines' fleet averaged 16.6 years and American Eagle Airlines' fleet averaged 9.6.
Doesn't mention why they didn't include this in the chart, but maybe it was just due to the way the information was presented in the 10-K.
Last edited by JC1120; Aug 15, 2013 at 9:54 am