Sabre Travel Network and Regent Seven Seas Cruises on Monday announced a new three-year agreement for participation in the Sabre GDS. The addition of Regent Seven Seas Cruises increases the number of cruise lines in Sabre to 13, and also enhances Regent's online booking resources for travel agents. To celebrate this new agreement, Regent Seven Seas unveiled a $25 per booking gift card incentive for all new bookings for seven nights or longer made through the Sabre GDS now through March 31.