In our print Reference Collection:

Plunkett's Airline, Hotel & Travel Industry Almanac
HE9803.A2P58 2014

 

Websites:

Association of European Airlines
News and industry analysis. 

IATA: Economics
Global industry analysis from the International Air Transport Association.

MIT Global Airline Industry Program
A research site with news and studies on the airline industry.

Airline Data and Statistics
Statistics for the U.S. airline industry from the Bureau of Transportation Statistics.