BTS Productshttps://doi.org/10.21949/15011282009RTFDatasetUnited States. Department of Transportation. Bureau of Transportation StatisticsUnited States. Department of Transportation. Bureau of Transportation StatisticsUnited StatesData filesStatisticsAirlinesRevenuesOperating costsThis report presents airline financial statistics obtained from carrier reports to DOT on BTS Form 41 financial schedules. Effective with a rule (ER-1297) adopted July 1982, the filing frequency for income statement and balance sheet data was changed from quarterly to semiannually for medium regional carriers with annual operating revenue less than $10 million. Semiannual financial data for these carriers appear as a supplement in June and December issues of this ...