Who should have to notify arilines about accomodations?

It seems like airlines, especially in Europe, pin a lot of their ability to deal with people with mobility disabilities on getting notification.
Notifying an airline ahead of time about your need for certain accommodations is all fine and good if you are the one making the arrangements. But what about if you use a travel agent? Whose responsibility is notification then?
A new European Union regulation makes it clear: notification for mobility issues is the travel agent's responsibility.
This article explains thta the definition of who is effected by this regulation -- which kicks in after July 26 -- is broad. Included are not just those who people would presume are permanently disabled, but also the temporarily disabled -- people who have broken limbs or are pregnant for example.
Under the law, travel agents will have to notify airlines about the mobility needs of their clients 48 hours before departure. The notification can be done through a variety of means.
If the traveler doesn't feel this is handled correctly, they can make a complaint to the Disability Rights Commission.
This seems to me like this is a reasonable law. If you're not the one who is making the actual arrangements, the timing etc. of notification might get kind of tricky. The travel agent ought to do it. And such notification can be key in getting the right accommodations.

Kudos to the EU for having the foresight to put this into the books.