I think it's important to also remember that the Minister of Fisheries, Oceans, and the Canadian Coast Guard has a role at the start of this process.
Bill C-64 and the activities around it clarify that the first point of contact when a wreck is identified is the Canadian Coast Guard. The Coast Guard would then be in touch with Parks Canada, which leads on heritage wrecks. If there is military involvement, then it is with DND, and certainly with Transport Canada.
It is important to note also that in the definition of “receiver of wreck”, wrecked aircraft in water are included, so the regulations that Parks Canada is talking about to deal with heritage wrecks and war graves would potentially include aircraft in the water.