Carnival Corp (CCL.N) shares are up 120% year to date, while shares of Royal Caribbean Cruises have more than doubled and Norwegian Cruise Line Holdings (NCLH.N) shares have gained 72%.

In April, 75.5% of surveyed hotel operators said they face shortages of regular employees while 78% said they lack part-time and other nonregular workers, according to the survey, which covered about 100 companies.