Hi AC insiders, can you kindly tell what is P-class? found some fares on ac.com, but could not find what fare class this is and terms.

Also an AC N-class seat, is equivalent to what class in a code-share Lufthansa or Swiss flight? Lufthansa/Swiss do not seem to have N-class.

Thanks
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I did post it in the sticking threat, but I think most people do not read it in that threat.