The cruise industry will take four years to recover from the pandemic and return to the level of prosperity it saw in 2019, according to investment bank UBS.

The entire sector has suffered billions of dollars in losses since the virus forced mass fleet lay-ups amid onboard coronavirus outbreaks that began as early as February.

Arnold Donald-led Carnival Corp, the world's largest owner with 104 ships, posted a $781m first-quarter loss, while Richard Fain-led Royal Caribbean Cruises and its 62 ships lost $1.4bn.