Air transportation services have evolved into a crucial building block for the world's socioeconomic growth. In the last four decades, the air travel across the world has grown by more
than 1000% and the air freight has increased by over 1400% while the national economies have
grown only three to four times. This phenomenal growth is due to a combination of three key
global drivers, namely, increase in disposable incomes, accelerated globalization and
deregulation of the aviation industry.