Carnival Cruise Line is running a promotion for fall cruises in which it will pay commission on the portion of the fare that is normally noncommissionable for the third and fourth passengers in a cabin.

The promotion, which runs through May 31, applies to select cruises this fall.

"As we grow #thelist (a list of agent-oriented initiatives) we're looking to activate initiatives that benefit both consumers and our travel partners," said Adolfo Perez, Carnival's senior vice president of sales and trade marketing.

The offer can be booked through, GDSs and Carnival's call center.

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