I think Australia allows cabotage under very specific circumstances. IIRC, Indonesia airlines are allowed to operate between major (capital?) cities but none have taken up that right. Australia did allow temporary cabotage during a major pilot strike in the '80s.

At least for a while a few years ago, you could book YVR-YYZ (that's all I tried) flights on NWA.com via MSP and other ports. Probably a programmign error.