The DOT, Department of Transportation, maintains a data base of tables of numbers for most of the part 121 airlines in North America, while that data is great to see, it sure makes it a lot more manageable to see the numbers in a graphic form, or as an actual graph. Enjoy.

Cost Per Gallon of Jet Fuel 2000-2015
Alaska - Jetblue - Virgin Revenue Passenger Miles
Employment 1970 to 2015
Average Air Fair from 1995-2014
Total Industry Net Revenue
Major / LCC Upgrade Graph
Total Pilots from 2001 - 2014   
Legacy Upgrade Graph   
Regional Upgrade Chart