A lurking WS CSA here. The secret to the numbering on WS flts is as follows...
a 500 or 600 flt number is on a 700 series aircraft. Any other flt number is a 200. The only time there is an exception to this and it rarely happens is if there is a tail swap for some reason on your flight number. I've seen it once or twice. Hope that helps...I'm very excited about the satellite TV onboard!