If you get the RED light, you will have to step aside and they will perform a quick (cursory) hand-check of your luggage GREEN light and you are good to go return your luggage to the aforementioned checked baggage counter.Ģ hours should be more than sufficient in MEX for your initial arrival, and more than enough time for the return trip where you are only and simply connecting flights. You will have to claim your luggage to clear Mexican Customs, and after the cursory Red / Green light, simply return your luggage to the return baggage counter (toward the right) to be forwarded to your MEX - OAX flight. Your bags should be checked all the way through from MIA - MEX - OAX. You will turn this card in to the gate agent for your return MEX - MIA flight. I like to slip it inside the rear cover of my passport under a large paperclip for safe keeping.

Mexican Immigration will give you a little receipt (chit), which is the bottom portion of the FMM card. As MEX is your first stop in the country of Mexico, yes, you will clear both Mexican Immigration and Customs (in that order), then arrive into Oaxaca as a domestic passenger (without having to clear Immigration and/or Customs again). I am sorry the first responder is a bit terse in their response.

Mexico city airport transfer time