Most mileage accounts have expiration dates. They all vary. Amex Membership rewards is one that miles don't expire. Even some accounts that are active can have miles expire. You really have to read the fine print and stay updated.
VOYAGER:
MC to FLL 11/07
MC/Dover 6/06
MARINER:
BCN / Ven 10/11
Alaska 2001|2006
Panama Canal 2003
NAV
Caribbean 11/06
Bermuda|New Eng/Canada 6/04
PG 5/05
OCEANIA
Nautica |Ist/Athens 6/07
Regatta|Baltics 6/08
Riviera 2013 Crossing -Istanbul to Miami
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