Most airline trips are uneventful; however, airlines don't guarantee their schedules, and you should realize this when planning your trip. There are many things that can make it impossible for flights to arrive on time. Some of these problems, such as bad weather and resulting air traffic delays, are beyond the airlines’ control. Others, such as the need for mechanical repairs, cannot be predicted. Nevertheless, you can take steps to reduce your chances of encountering most problems and limit their effects.