https://www.airtransat.com/en-GB/travel-information/customer-service/disruptions-recourses/denied-boarding
If you have been denied a reserved seat on Air Transat you are probably entitled to monetary compensation.
denied boardingair transat
https://www.fox13now.com/news/coronavirus/local-coronavirus-news/utah-family-denied-cruise-ship-boarding-despite-covid-19-tests-vaccines
A Utah family says their vacation ended before it started when they were denied boarding on a Carnival cruise ship.
cruise shiputahfamilydeniedboarding