WestJet Rewards - Westjet Business class?

Hi everyone

I'm an Air Canada guy, but found a great fare from YEG to KBP on Westjet/KLM/Ukraine international in business class on expedia.

All flights show as "Z" booking class, business class. I've only flown westjet a few times, but know enough to remember there is no business class, so why is it showing this?

Edmonton (YEG) to Montreal (YUL)
KLM 8011 operated by WestJet
Business Class (Z), Boeing 737
Depart 10:00am Arrive 5:32pm Duration: 5h 32m
KL KLM 8011 Z Boeing 737 YEG Edmonton YUL Montreal 2012-02-18T10:00:00-07:00 737 true
2 WS
Layover: Montreal (YUL) 1h 23m

Is it a glitch? Are they offering free middle seats on certain planes within Canada as well now? I'm just curious because it's a few hundred dollars cheaper than the other options, but those all include an AC business class seat out east from YEG....

Unfortunately, at this time, WS does not offer business class or unoccupied middle seats for free. Sorry! Hope you enjoy your travels! :)

Obviously something WS will have to address as it increases these codeshares that feed international flights on various carriers. Likely Z/business fare is coded this way for simplicity in fare construction. Curious what the same flights on KLM are ex-YUL in this fare class to see the difference that goes to WS.