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What does it cost to operate an airline? English and French companies generally guard this secret. But the Franco-Rumanian Air Transport Company, which carries passengers, freight and mail from Paris to Bucharest across Central Europe, gave figures. It spent 17,000,000 francs in 1923, or about $850,000, flying 10,090 hr. and 800,000 mi.--something over a dollar a mile. How was the dollar spent? Twenty-five cents for depreciation, 25c. for upkeep of plane and motor, 12c. for fuel and oil, 3c. for automobile transportation, 20c. for pay of pilots and other personnel, 4c. for insurance and lie. for commercial operation including management and publicity.