Mexico City Airport presents a challenge to the most seasoned travelers, though surprisingly few actually end up missing their connections there. The quicker you realize that there is no chance of making sense of it on your own and you seek out an information booth, the better. The airport chaos turns out to have a relatively simple explanation. Airlines do not own their gates like they do at most airports throughout the world. Thus incoming aircraft have no assigned place to go until within about fifteen minutes of landing, when airport traffic control assigns them a gate. If you have a one to four hour layover, like most people, you have no idea which gate your plane is leaving from til about a half hour before takeoff. There are departure and arrival screens throughout the airport, but they rarely contain any more information than your aircraft is leaving from Gate B - the domestic area - or Gate D - the international area if you're on your way home. When I asked where "Gate D" was the first time I experienced the anarchy, the information booth told me as if it was patently obvious that Gate D meant Gate 19, in the international area. I went to Gate 19 to find no trace of my flight at Gates 19A, 19B, 19C, or 19D, and joined the frantic mob at the information booth there. The man in front of me ascertained Miami was Gate 28, and we ran off in that direction. There was no sign on the gate at 28 that it was the Miami flight, but the staff there assured me it was. Lesson - ask, ask, and ask again. Never be too proud not to ask for help in Mexico City. You'll never find your flight otherwise. The present situation without Mexicana in business anymore is complicated. Coming into the country, if you arrive on American or United, you arrive at Terminal 1 and you have to clear Immigration in Mexico City, but not Customs if you're flying AeroMar (you clear that in Huatulco). Then you have to make your way to the other end of the terminal for the domestic check in area and seek out Interjet or AeroMar. If you arrive on Continental or AeroMexico to Terminal 2, heaven help you. I only learned that Terminal 2 existed recently, never having flown either airline in or out of Mexico City before. You clear immigration, and go thru Customs with your carry-on, but your checked baggage is routed through to Huatulco and you have to clear Customs there if you're getting on an AeroMar flight here in Mexico City. Ask where Sala M and the Air Train is, ask repeatedly, because there are no signs and you'll never find it otherwise. The AirTrain takes you over to Terminal 1 where you'll have to find the AeroMar or Interjet flight. If your flight isn't for a few hours, don't worry about it, there's no point in trying to find out more than an hour before. The food court area is upstairs in the domestic part of Terminal 1, and there are plenty of places to get a bite to eat while you're waiting. CAUTION - DON'T pay any attention to the info on the monitors at the food court. I did so once and saw my flight was listed as leaving later than scheduled, dallied a little longer there, and when I got to the gate found out the flight was leaving on time and the gate was already shut.