Dataset: airline_costs.dat Source: J.W. Proctor and J.S. Duncan (1954). "A Regression Analysis of Airline Costs," Journal of Air Law and Commerce, Vol.21, #3, pp.282-292. Description: Regression relating Operating Costs per revenue ton-mile to 7 factors: length of flight, speed of plane, daily flight time per aircraft, population served, ton-mile load factor, available tons per aircraft mile, and firms net assets. Regression based on natural logarithms of all factors, except load factor. Load factor and available tons (capacity) for Northeast Airlines was imputed from summary calculations. Variables/columns Airline 1-20 Length of flight (miles) 22-28 Speed of Plane (miles per hour) 30-36 Daily Flight Time per plane (hours) 38-44 Population served (1000s) 46-52 Total Operating Cost (cents per revenue ton-mile) 54-60 Revenue Tons per Aircraft mile 62-68 Ton-Mile load factor (proportion) 70-76 Available Capacity (Tons per mile) 78-84 Total Assets ($100,000s) 86-92 Investments and Special Funds ($100,000s) 94-100 Adjusted Assets ($100,000s) 102-108