Join Date: Dec 2005
Location: NYC
Programs: SPG, AA, BA, CO, UA, US, B6, DL, Amex MR, HH
Posts: 1,009
Once AMEX transfers its MR points into another program, I don't believe that they can transfer them back - to AMEX it's as if they've been spent. If, however, there's a credit on your account and requires the debit of points, you'll have a negative number in your MR account, which you'll have to pay for if you close your account at that time (I think at $0.025/point).