For purposes of comfort and/or carriage of baggage in the cabin which does not fit in the overhead bin, passengers may book an extra seat. The fare to be paid is the normal fare which would have been charged to a passenger, occupying such a seat. In case the seat is booked for carriage of baggage, the maximum weight of any such baggage shall not exceed 75 kilos per seat. The baggage is subject to security clearances for carriage in the cabin.