Royal Caribbean International yesterday (Sunday) reached a milestone in its 45-year history by welcoming its 50 millionth passenger on board its fleet of 21 ships.

The occasion kicked off a year-long celebration to honour the cruise line’s passengers, business partners, employees and crew.

Each of Royal Caribbean’s ships around the world will recognise the 50 millionth passenger with special events.

The onboard events will mark the start of a year-long campaign where consumers are being encouraged to share their favourite ‘WOW’ moments with Royal Caribbean over the years by posting photos, videos and memorable stories on Facebook, Twitter and Instagram with the hashtag #RoyalWOW.

Global sales and marketing executive vice president Lisa Bauer said: “As we mark this incredible milestone, we are inviting guests to relive those special moments and celebrate with us by sharing their personal Royal WOWS.”

President and chief executive Adam Goldstein said: “For more than 45 years, Royal Caribbean’s guiding principle has been to deliver the WOW to our guests, providing them with experiences, services and amenities that can only be found on Royal Caribbean.

“The men and women on our ships who deliver these WOW moments are what inspire our loyal guests to return to sail with us again and again.”