19.11.1 If an operating airline places a passenger in a class higher than that for which the ticket was purchased, it may not request any supplementary payment.
19.11.2 If an operating airline places a passenger in a class lower than that for which the ticket was purchased, by the means provided for in Section 19.8.3, it shall immediately reimburse the difference to the passenger in accordance with the mode of payment within 30 days from the date of travel, plus:
(i) 30% of the price of the ticket for all domestic flights immediately, and
(ii) 50% of the price of the ticket for all international flights within 14 days.
