Here's a few no-brainers...
- YYT and maybe YHZ to LHR (may be too much lobster freight from YHZ)
- YYZ-MEX
- YYZ- northern South America (Bogota, Caracas if Venezuela gets its house in order)
- YYZ-BGI and any non-rouged destination in the Caribbean
- YYZ-BDA
- YVR and possibly YYC to some destinations in Hawaii