A few random thoughts:

Click has a really odd route structure. Nuevo Laredo to Puerto Escondido?? And at $2000MXN one way, it's no deal. I would have expected some of the TIJ and/or AeroCalifornia/Aviacsa routes would have low fare Click service. They seem to be less popular routes, and it'll be interesting to see how they do. Then again, Click could be another way to just designated no-frills service without necessarily the low fare component.

>>>> Speaking of Other North American Frequent Flyer Programs, we should mention Aviacsa's Buy 5 get 1 free program. Kinda rudimentary, where you have to keep track of ticket receipts, but it's an option and can give a faster return than travel on AM and MX. A nuance is that the free trip is on the route most traveled for the lowest level of buy 5 get 1 free-- counter to the mileage run concept of flying cheap routes to redeem on expensive ones, but 7 paid flights can get you around the "most traveled route" rule, and 8 flights are good for a US-Mexico transborder ticket.

Check details at http://www.aviacsa.com/WEB/aviacpass/aviacpass.html