Passenger Miles on Commercial US Airlines, 1937–1960
The revenue passenger miles flown by commercial airlines in
the United States for each year from 1937 to 1960.
A time series of 24 observations; yearly, 1937–1960.
F.A.A. Statistical Handbook of Aviation.
Brown, R. G. (1963)
Smoothing, Forecasting and Prediction of Discrete Time Series.
plot(airmiles, main = "airmiles data",
xlab = "Passenger-miles flown by U.S. commercial airlines", col = 4)