The affected ships are Symphony of the Seas, Jewel of the Seas, Vision of the Seas and Serenade of the Seas.

The line cited "ongoing Covid-related circumstances around the world" for its decision, which is said was made out of an "abundance of caution".

"We regret having to cancel our guests’ long-awaited vacations and appreciate their loyalty and understanding," said RCI.

"Our top priority is always the well-being of our guests, our crew and the communities we visit."

The decision affects sailings onboard the following ships:

• Symphony of the Seas sailings from 8-22 January, returning to service 29 January;
  
  
• Jewel of the Seas sailings from 9 January to 12 February, returning to service on 20 February;
  
  
• Vision of the Seas’ return to cruising has been postponed until 7 March; and
  
  
• Serenade of the Seas sailings from 8 January to 5 March, with the ship returning to service on 26 April after a period in dry dock