Having lost FCC money when Genting HK (Crystal Cruises owner) collapsed, I learned that most of the creditors' claims (e.g. lenders, bond holders, crews, ports, suppliers, TAs, etc.) have a priority position ahead of customer claims. Reliable insurance and good credit card back up are very important.
Carnival had a Net Loss of $10.2 billion for fiscal year 2020 and $9.5 billion for fiscal year 2021, ending on Nov 30. They had an additional Net Loss of $1.3 billion for the latest half year, ending on May 31.
By issuing $1 billion of new stock they will improve their liquidity and cash positions, but they also need to eliminate their recurring losses.