I purchased airfare from YYZ-MEX-BJX-ZIH-MEX-YYZ back in April for the crazy-low price of $408 per person. I just engaged in an online chat with AM to inquire about upgrading to Premier Class for our return flight, since it's an overnight. I was very surprised to learn that the upgrade is only $220 per person, so now I am thinking of upgrading the outbound flight too.

I have just finished reading some reviews and trip reports here, and it looks like the AeroMexico Business Class experience is not very highly regarded to say the least. But still, it would have to be worth $220, wouldn't it?