Well they took an atomic clock on plane far slower than the blackbird and flew it around the world and it was off by a fraction of a second.
Let's say we develop an aircraft, say, star wars movie type stuff. What would be the outcome. Will we be able to go forward or backward in time? It's an intriguing topic.
There's a difference between 1/2 and 1/200000000. Both are fractions :)
From a website:
"Several Russian cosmonauts have spent a year or more in Earth orbit on the space station Mir. Their orbital velocity, about 7700 metres per second . . . each second on board Mir, 1.00000000033 seconds pass on Earth. For every second you age on Earth, the cosmonaut in orbit ages 3 nanoseconds less. This doesn't seem like much, but it adds up; after a year the cosmonaut's watch will be 3.8 seconds behind your earthbound timepiece."