The carrier may refuse to transport passengers and/or their baggage if one of the following situations has occurred, whether or not before the flight, or is likely to occur:
a) in its reasonable discretion, the carrier determines that refusal to transport is necessary in order to comply with any applicable laws, regulations or orders of any state or country to be flown from, into or over.
b) the passenger has expressed himself in such a way or displayed such behaviour that doubt exists whether or not the safety of one or several persons, goods or the aircraft itself can be guaranteed. Such expression or display includes the use of threatening, abusive or insulting language or the (menace of) engagement in aggressive, violent or threatening acts towards ground staff or crew, fellow passengers or any other persons;
c) the passenger’s conduct or physical or mental state is such (e.g. due to the consumption of alcohol or the use of drugs or medication) that it could cause discomfort, a hazard or risk to him/herself, the other passengers, the crew, other persons, goods, equipment, or the aircraft;
d) the passenger is, or appears to be in the unlawful possession of drugs;
e) the passenger has compromised security, good order and/or discipline when checking in for the flight, or, in case of connecting flights, on a previous flight, and the carrier has reason to believe that such conduct may be repeated;
f) immigration and/or customs and/or any other official authority has informed the carrier (either orally or in writing) that the passenger is not allowed to travel;
g) the passenger has refused to undergo the security checks, or has refused or is unable to provide proof of his/her identity;
h) the passenger is unable to prove that they are the person referred to as the passenger on the ticket;
i) the fare in force and/or all the applicable fees, levies, taxes and charges have not been paid in full;
j) the passenger is not or does not appear to be in the possession of the required travel documents, may seek or has sought to enter a country through which he may be in transit, or for which he does not have any valid entry documents;
k) the passenger has destroyed his/her travel documents during the flight or has tried to do so, has refused to allow copies thereof to be made and kept by the carrier, or has refused to hand over his/her travel documents in exchange for a receipt when asked to do so by the crew;
l) the passenger’s travel documents have expired or are incomplete in light of the regulations in force, or appear to be fraudulent, forged or otherwise suspicious;
m) the ticket presented by the passenger is invalid, was unlawfully acquired, is in a different name, was forged or is listed as a lost or stolen document;
o) during check-in or boarding it turns out that the passenger requires special attention that was not requested in time, or that cannot be provided by the carrier;
p) the passenger did not comply with the instructions and regulations concerning security and/or safety as provided by or on behalf of the carrier or any competent official body or security organisation;
q) the passenger refuses to pay the excess baggage fee, or it is established that the passenger is trying to get around the excess baggage charges;
In all of these cases (the list is not exhaustive), the carrier reserves the right to refuse to transport the passenger (any further), and to cancel the booking without refund.