# The international airline passenger series describes 
# monthly totals of the international passengers for 
# the period between Jan 1949 and Dec 1960.
# Box and Jenkins (1976): Times Series Analysis: Forecasting and Control, p. 531

data = read.table("airline.txt",header=TRUE)

attach(data)

year = 1949:1960
ind  = seq(1,nrow(data),by=12)
plot(airline,xlab="Year",ylab="Total passengers (in thousands)",
     axes=FALSE,type="l")
axis(2);box();axis(1,at=ind,lab=year)