When do the Spirit LinQ Certificates expire?
All 2005, 2006 and 2007 Spirit LinQ certificates have an expiration date printed in the bottom left-hand corner. This date applies to the total amount of the certificate. If you only use part of the value, the amount remaining on the certificate must also be used by the expiration date printed on it. All 2004 certificates (the only ones without printed expiration dates) expired on Dec. 15, 2005 and are no longer valid for redemption.