Carnival Cruise Line has joined others in cancelling their May cruises.
The cruise line announced on Wednesday it has decided to cancel all of its U.S. departures through May 31, 2021.
In a statement, the cruise line said a "date for the return of guest cruising operations from U.S. ports has not yet been determined."
With the new round of cancellations, Carnival cruise ships won’t begin sailings until June at the earliest.
Booked guests and travel agents are being notified directly of the cancellations and their options for a generous future cruise credit and onboard credit package, or a full refund.
Carnival Cruise Line President Christine Duffy added this to the official announcement, "We continue to work on plans to resume operations and are encouraged by the focus to expedite vaccine production and distribution which are having a demonstrated impact on improving public health.
"We appreciate the support of all of our guests, employees and trade partners who we know are looking forward to our return."
With this announcement, Carnival matches Norwegian and Disney's decisions to also cancel April 2021 cruises.
All cruise lines are waiting for the U.S. Center for Disease Control (CDC) to provide additional technical instructions for cruise lines to implement in order to begin test sailings.