Over the last 30 years, the price of airfare has fallen over 50%. It goes to show, since airlines have lost money every other year since 1981. The tourism industry bled $51 billion in the 10 year span between 2001 and 2011 as more competition entered the space.

H/T Visual Capitalist

Chinese tourism

The Economic Impact of Tourism by Country and State

Tourism infographic

Infographic source: Online Accounting Degrees