8.2.1. To ensure the safety and security of a flight, we reserve the right to refuse carriage of a passenger or cancel any unused ticket portions of a passenger in the following cases: (i) The passenger exhibits disruptive behaviors; or (ii) is unable to control their behaviors; or (iii) we find the mental and physical conditions of the passenger to be threatening to their own safety; or (iv) the passenger is denied entry; or (v) fails to comply with regulations and instructions of aviation employees at an airport, airfield, or on board an aircraft; or (vi) disturbs order and discipline at an airport, airfield, or on board an aircraft; or (vii) a deportee without an escort; or (viii) provides false information to an extent that endangers the safety and security of an airport, airfield, on board an aircraft in flight or on ground, and other passengers; or (ix) at the request of Vietnamese or foreign aviation authorities.