If the Volaris flight from Tijuana to Cancún requires just a stop in Mexico City and not a change of planes, then I guess the risk of a misplaced bag is less than changing planes and flying to Chetumal. Of course anytime and anywhere you put valuable items like computers, cameras, etc. in a checked bag you run a risk. I've had several items stolen out of my checked bags over the years, in the U.S. and elsewhere. I would never put valuable electronics in a checked bag, regardless of the airline or even if it is a nonstop or direct.