India is one of the fastest growing aviation markets in the world. With the liberalization of the Indian aviation sector, the industry has witnessed a transformation with the entry of the privately owned full service airlines and low cost carriers. As of May 2006, private carriers accounted for around 75% share of the domestic aviation market. The sector has also seen a significant increase in number of domestic air travel passengers. Some of the factors that have resulted in higher demand for air transport in India include the growing middle class and its purchasing power, low airfares offered by low cost carriers, the growth of the tourism industry in India, increasing outbound travel from India, and the overall economic growth of India. In addition to these factors, the emphasis on modernization of non-metro airports, fleet expansion by airlines, service expansion by state owned carriers, development of the maintenance, repair and overhaul (MRO) industry in India, opening up of new international routes by the Indian government, establishment of new airports and renovation and restructuring of the existing airports have added to the growth of the industry.