19.5.1. Every operating air carrier shall establish boarding priority procedures and criteria for determining which passengers holding confirmed reserved space shall be denied boarding on an oversold flight if an insufficient number of volunteers come forward. Such procedures and criteria shall reflect the obligations of the operating air carrier set forth in sections 19.4.1 and 19.4.2 to minimize involuntary denied boarding and to request for volunteers, and shall be written in such manner as to be understandable and meaningful to the average passenger. Such procedures and criteria shall not make, give, or cause any undue or unreasonable preference or advantage to any particular person or subject any particular person to any unjust or unreasonable prejudice or disadvantage in any respect whatsoever.
19.5.2. Boarding priority factors may include, but are not limited to, the following:
(i) passengers on urgent medical trips ;
(ii) a passenger’s time of check-in ;
(iii) whether a passenger has a seat assignment prior to boarding ;
(iv) the fare paid by a passenger ;
(v) a passenger’s frequent-flyer status ;
(vi) a passenger’s reduced mobility status, including unaccompanied minors ;
(vii) Families (maximum of two adults) where at least one child is aged five years or under.
19.5.3. If an insufficient number of volunteers come forward to allow the remaining passengers with reservations to board the flight, the operating air carrier may then deny boarding to passengers involuntarily.
19.5.4. If boarding is denied to passengers involuntarily, the operating air carrier shall immediately compensate them in accordance with Sections 19.8 and 19.9; and assist them in accordance with Sections 19.10; 19.11 and 19.12
19.5.5. Every air carrier shall develop and file with the Authority Boarding Priority Procedures consistent with these Regulations.