I got some mail yesterday that was postmarked December 28th (no, not THE letter). Post office appears to be acting on the "Snail Mail" concept. I think that these letter must be coming from a mailing house and from what I know they seem alphabetical.

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