When it comes to discussing the benefits or disadvatages brought by bicycles, autmobiles and airplanes, I am inclined to believe that the airplanes revolutionally changed the lives of people. On one hand, since the advent of airplanes, people could work and live more conveniently than ever before. On the other hand, some advantages like travelling faster without exhusting the passion of people, bringing less pollution than autmobiles and so on.One contribution of the inventing of the airplanes is that aircrafts creat remarkable convenience to the daily routines. In the past period, for example, my grandfather wanted to go to university from his hometown, it would take more than one week to cover only a few hundrend miles. But now, the planes could take people to the expected place which locates less than one thound miles within one hour covering. This is the great benefits generated by the aeroplanes. Another case is that if some important person attend an imperative conference within two hours, of course, the best choice of going to the place one thound away is by air. So, I hold the belief that the airplanes have changed the lives of people.Certainly, apart from the striking convenience of the aircrafts,  people could enjoy much confort created by planes. Twenty years ago, the planes is not accessible to ordinary people, most of person have no choice but to take autmobiles, when they arrived their destination, the passion and enthusiasm has been sweept away by the long hour journey. They have to spend more time to relax than travell. But now, planes is widely accepted by the common, they can go to their desired destination without wasting their energy and have an enjoyful weekends.However, the ariplanes have some minor drawbacks, such as we could not take plane to work within one city.  At this time, we only take autmobiles to go to work. compared with bicycles, the planes contaminate our environment and  pose more or less threat to the atmosphere. For example, extensive pollution was poured into the air when the planes take off.In sum, from all the reasons explanated above, we can safely come to the conclusion that the airplane has changed the lives of people. Without it, our lives could be intensively impeded and much of convience can not be obtained.