These days, we cna see a flight that have a long time use the same fuel as the vehicles in a long run; however, the number of greenhouse gas that are emissioned by both of them are the same. As a result, a group of people believe instead of limit using cars the figure of flights out to be reudced and prevent tourist journey. I do not subscribe to this idea owing to the fact that , today, not only time but also the environment is the most important factor, so airlines have to upgrade their planes and governments create a fast clean transportation systems.