CCL-Carnival Cruise Line removed all scheduled for July 2021 sailings except for 3 of its vessels - Carnival Vista, Carnival Breeze, and Carnival Horizon - which are the only ones currently listed for July bookings. All cruises on other boats have been removed for the same month.
CCL has not currently canceled the voyages they removed from the booking engine. However, each time when they have removed sailings they were canceled at a later time.
While cruises from the USA have been shut down for 14 months, cruise liners have been sailing in other parts of the world since August 2020.
The USA's CDC agency (Centers for Disease Control and Prevention) said on April 28 that cruising could restart in midsummer in the USA.
While the CDC outlined a potential restart date for cruises departing from United States' ports this summer, that does not mean that the restrictions on sailings are lifted. The CDC offered clarifications to its guidance based on cruise industry feedback and still expects lines to meet its requirements before passenger operations can resume.