1. The firm's total assets [BTS Schedule B-1 data item 18990;Assets;$million. (Source: Bureau of Transportation Statistics, Form 41 Financial Data)
2. Earnings: The firm's income before discontinued operations and extraordinary items [BTS Schedule P-12 data item 91990] + depreciation and amortization;Source: Bureau of Transportation Statistics, Form 41 Financial Data)
3. The average total fuel cost per gallon for the entire airlines industry in a year;Airline Fuel Cost and Consumption -U.S. Carriers -Scheduled)