Do I have to wear a mask during the flight?

Currently (as of December 2022) passengers are not required to wear a mask on board. Whether a mask has to be worn on the day of your flight is up to the official regulations and whether the organizer exercises his domestic authority to prescribe masks during the flight. If so, it should be explained in the possible dates. Pilots are usually subject to not these specifications. Of course you can always wear a mask at carnival / carnival.