<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by kalman911:
so does that mean that United miles can also be converted into Continental miles using Amtrak?</font>
Nope
<font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Does this apply to any other airlines?</font>
I believe that Midwest Airlines miles can be converted to either Continental or United.
And Continental miles can be converted to either Midwest or United.
But United miles cannot be converted -- because Amtrak points can be redeemed for United miles, but United miles cannot be redeemed for Amtrak points.
(I have no direct experience with the conversion of Midwest Miles, so others may know more here.)
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View from the Wing: A blog about Free Miles and Free Markets