Too bad BA is no longer flying the YYZ-JFK route - would have been any easy way to hit another OneWorld carrier - and cheaply too - I flew that BA route once for CAD$99+tax.

I checked YVR-JFK-YVR on CX on expedia and it's USD $300 with tax (published fare) - that was the cheapest fare on the route as AC and CP were both about USD $400. However the CX flight times are fairly inconvenient (esp. JFK-YVR).

Still looking for an easy way to get a 4th OW carrier - maybe a weekend hop across the pond.