link On the 20th RVSM takes effect in the Domestic Airspace (lower 48) and some coastal areas. This has huge impications for pilots/faa/airlines. It is supposed to allow airplanes above 29,000' to 41,000' to fly at altitudes 1000' apart, it has been 2000' seperation vertically. This type airspace has been in effect in Europe and some oceanic areas for sometime, but just coming to the US as of jan 20th. It may be a small hiccup at the get go, so those of you flying on the 20th (me included) beware of possible delays.