Thank you for the question.
The law is already quite clear in this area that airlines have to re-book passengers on alternative flights. Certainly, that has been applicable to large carriers, both domestic and international. It is applicable through the Montreal Convention. Even the small carriers operating internationally...although it may be harder for passengers to enforce that.
That's one more reason why we so strongly support abolishing the distinction between small and large carriers, or lowering the threshold for small and large carriers. It's to clarify that point.