We put in our air deviation request this week (though our travel agent) for our upcoming cruise in August on the Navigator. We requested Delta flights (including some Virgin Atlantic code shares) as this is what we had used on our previous cruise with Regent, and we prefer Delta over American or United. Much to our surprise our TA informed us that she had been told Delta had canceled their contract with Regent three weeks ago, and trying to use Regent to book these flights with Delta would cost almost 3X as opposed to booking them ourselves!
After much discussion and research, we decided to go with the Regent-offered flights on United and American instead of just canceling the Regent air, taking the credit, and booking things ourselves. Somewhat disappointing and frustrating, but I guess vendors come and go.......