DELTA AIR LINES INC. revenue for the last year amounted to 55.06 B EUR, the most of which — 55.06 B EUR — came from its highest performing source at the moment, Airline, the year earlier bringing 49.53 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought DELTA AIR LINES INC. 42.03 B EUR, and the year before that — 37.01 B EUR.