In the past, travelling by air was unimaginable for most Chinese. Nowadays, however, with the economic development and improved living standards, more and more Chinese, including many farmers and migrant workers, can afford to travel by air. They can take planes to all large cities, and many other cities are also planning to build airports. Air services are being constantly improved and cheap airline tickets are often available. In recent years, the number of people choosing to (ravel by plane during holidays has been increasing.