cannabineer
Ursus marijanus
They've confirmed the effect with an atomic clock on a jetliner.Theoretically even being in a plane makes you age slower. "The faster you go, the slower you age."
But I personally don't think that would be true.
http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/airtim.html
If the idea of westward flight gaining time doesn't make sense, consider that the earth is rotating. A westward flight is a despinning act ... the plane is slower than the surface under it. cn