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