funny coincidence, I just returned from Mexico City, was there for the long weekend.

Benito Juarez airport is quite modern, nothing to worry about. Not sure about activities for children.

I flew Mexicana airlines and the service was MUCH better than any domestic US airline, sorry to say.

Not sure about Aeromexico but Mexicana departed from Tom Bradley International Terminal. The signs should be clearly marked for the airline.

Enjoy Cancun, it’s a pretty nice place..especially the Nichupte Lagoon at night!