Obviously, if I noticed that I wasn't receiving service in the language of my choice, my first reflex would not necessarily be to go complain to the Commissioner of Official Languages. There must be hundreds, or even thousands of travelers who experience this, but who do not necessarily bother to complain. As for the 30 people in question, they may be a reflection of a certain number of people who are not happy with the services.
When you talk about visual active offer, does this mean you consider what happens inside airports as well as the service offered there, more specifically in certain locations? Do you consider the entire airport or only the location where the service must be provided?