One method of time travel available to the average person today, is a plane trip. Every time you travel

in an aeroplane you are travelling one four hundredth of a second into the future. This is because of time

dilation. The average aeroplane travels at 300mph, at that speed, time dilation is detectable by atomic

clocks. In 1971, Joe Hafele and Richard Keating carried out an experiment to show that time dilation

was present on an aeroplane. They used two synchronised atomic clocks in their experiment. One

clock was kept on the ground while the other was put on an aeroplane for a trip around the world.

When the flight was finished they compared the clock on the ground with the one on the plane. They

found a one four hundredth of a second difference between them due to time dilation. To travel a week

forward in time you would need to travel 241,920,000 times around the world by aeroplane. It was a

nice idea for time travel but it simply isn’t feasible.