I need two things:
1) dollar amount of airline ticket sales yearly for the past 50 years
domestically and worldwide. Every year doesn't have to be there but
enough years have to be represented to be able to formulate a graph
that points out trends.
2) average price of airline tickets yearly for the past 50 years.
Again, a few data points is fine as long as it is enough to formulate
a graph pointing out trends.