Sailing one line doesn't get you any kind of "points" towards loyalty on the other, but you do get past guest pricing on any of Carnival Corp.'s lines.
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Carnival Fantasy (New Orleans) 02/07-Cozumel
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Carnival Victory (New York) 06/08-Canada
<center></center>Carnival Pride (Baltimore) 2/7/10-Bahamas Snowmageddon Escape
Carnival Glory (New York) 6/19/10-Canada

Carnival Glory (Boston) 6/10/12- Canadian B2B!
Carnival Glory (Boston) 6/14/12-Canadian B2B!
Carnival Pride (Baltimore) 11/2/12-Superstorm Sandy Special!
Carnival Pride (Baltimore) 1/13/13-
Wedding Cruise to the Bahamas! Pre-Wedding Tour Review Wedding Review
Carnival Pride (Baltimore) 2/24/13- Honeymoon to the Bahamas

Carnival Glory (Boston) 06/16/13-Canadian B2B to Platinum!
Carnival Glory (Boston) 06/20/13- B2B Birthday Princess Cruise
Carnival Fantasy (Charleston) 11/19/13- Wife's Platinum Cruise
Carnival Freedom (Ft. Lauderdale) 11/23/14-Thanksgiving with Dr. Seuss!

Carnival Pride (Baltimore) 10/26/2015 First Trip to Bermuda!
Carnival Sunshine (New York) 10/8/2016-Canada