History for today's industry starts in the middle 1980s. Air travel has doubled since 1985. Travel growth outpaces economic growth. Travel growth may be divided into two parts. Travel responds more strongly to economic changes in the short term than in the long term.
Economic growth causes a simple proportional increase in travel growth over the long term.
Air travel growth surpasses growth in a country's economy. Trends From History, continued Lower fares are one of the causes of extra growth. Growing world trade is a second reason travel growth exceeds economic growth. The third part of air travel growth beyond economic growth comes from more flights. Increased frequencies are coupled with a gradual movement toward smaller airplane size.