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upgrade certificates

Question asked by tonyc25 on Dec 12, 2013
Latest reply on Dec 12, 2013 by madmax

I understand  the points needed to book a room , but some room require e certificate and 1 or 2 upgrade certificates. What are upgrade certificates and how do you know how many you have? Also my account says  I have accumulated a bunch of elite nights. What are these?    thanks  guys