In fact, you can use your Ontario photo ID Card - to board a domestic flight within Canada. As Transport Canada regulations state that you must have at least one (1) piece of government issued photo ID if travel within Canada.
Read the details here: »www.passengerprotect.gc.ca/ident···nts.html
As air transport security is under federal jurisdiction, those laws trump (override) provincial laws. Likewise, many federal agencies do follow provincial law, others don't.