It is possible, Ive seen this docu of timetraveling or something on Discovery... They got 2 atom clocks (clocks wich are accurate in like 0,00001, or something, of a second) in each 747's... both in the air... 1 had to fly half his speed... and 1 full speed. Both needed to make 1 round around the world.
And when they came back, they saw that the one in full speed travelled back in time for like ... 0,03 seconds (something like that).
Goddamn... I had to take almost 15 minutes to type this message, just because of that juicy ass shakin pic of urs!!!!!!! DAUMN!