Regulation (EU) 2018/395
The pilot-in-command shall have the authority to:
give all commands and take any appropriate actions for the purpose of ensuring the safety of the balloon and of any person or property carried therein; and
refuse embarkation or carriage of any person or baggage that may represent a potential hazard to the safety of the balloon or of any person or property carried therein.
BOP.BAS.040 Responsibilities of crew members