SkyTime helps you manage time while on an airplane. It calculates elapsed and remaining flight time. And it lets you know what the current time is at the origin and destination locations, adjusting for timezone differences. It also helps you overcome jetlag by calculating two average times, which helps you know when to sleep on the plane. One is the average between the current time at the origin and destination. The other is an average time that is weighted by elapsed flight time, so that you can transition slowly into the new timezone. When you reach your destination, you can press a button to easily update your handheld's system clock to reflect the new timezone.