I'm guessing that is somehow ambiguous...

The requirement for IKK is not "it isn't overbooked", but that it has positive space.

200/200 isn't overbooked, but IKK is not available, because it's full.

199/200 has positive space, and therefore has IKK.

How does Cow know factually that it is overbooked?

Just to be clear, I never said it was overbooked.

​​​​​​

Had does Cow know "Factually" if positive space exists ?

Kill me now.
What [MENTION=599574]canadiancow[/MENTION] said. And What [MENTION=759220]Adam Smith[/MENTION] said what cow said.

Some things are best left unsaid. He has provided very accurate information for similar things in other threads in the past.

He has udder ways to find information.

The bigger question is, if there's J space why are you even bothering with IKK? ;-)

update from AC
 

So here is the response from the AC concierge...Either there is a drastic change to IKK that has not be communicated or there is some mis-information.

​​​​​​Hello / Bonjour XXXXX


We have confirmed with our Aeroplan lead and in fact the capacity control applies to the entire flight in economy and for the signature class regardless of one's status (we have specified to the lead that this was for a SE member). The flight is currently not oversold in Y however this booking needs to be processed through Aeroplan.

Is there positive space?

Just book a J seat without even needing IKK.

That is really not the point...there is a big issue here. I should be able to get these seats and there is alot of misinformation here.

Without wanting to spend time right now looking things up, I think AC introduced "capacity controls" to "Signature Service" flights within North America in the last year or two.

I agree it is rather disturbing if that now also applies to Y on flights with Signature J service. It should not given the verbiage that AC publishes about priority rewards.

https://altitude.aircanada.com/status/priority-rewards

This is an A321 not a lie flat signature class flight!