In old days, for most Chinese people, it was beyond imagination that we could travel by air. Nowadays, with the advancement of economy and improvement of living standard, there are a growing number of Chinese people, including farmers and migrant workers, are able to afford air traveling. All the big cities are their destinations while new airports are to be constructed in many other cities. Air service is continually improving, and sometimes there will be special offers for air tickets. In recent years, the number of people who choose to travel by air during holidays is constantly increasing.