Warnings to the Wise for Happy Travel to South America or elsewhere. On a recent trip to Santiago, United Airlines routed us through Mexico City. What we were not prepared for with our 3 1/2 hour layover was that there is no Transit Area for International Travelers. We had purchased alcohol in San Francisco Duty Free to bring to our in-laws in Santiago. Because there is no transit area, we spent 2+ hours in the Disney-like Immigration Lines, before going through Customs to actually enter Mexico, only to switch terminals! We then had to check-in to our airline (LAN), which took some doing as several of the staff working for LAN there did not seem to have any idea what they were doing. The staff at Mexico City airport were uneducated, bordered on being rude, and continually provided us with misinformation about the terminal we needed to be in. This was not bad enough, but then we had to be re-xrayed and our duty-free was confiscated because it was more than 4 ounces. (Recall, we had no idea that we would have to go all of the way through customs and immigration just to change planes.) The issue with duty-free never would have happened had we been informed about the rules with Mexico City Airport. Had we been informed, we also would not have flown through Mexico City! I would highly suggest that International Travelers DO NOT transit through Mexico City until they get this situation rectified!!!!! If you have had this experience in Mexico City, please complain to your airline, so that they are informed. When I spoke with the United Airlines Representative, she stated that this was news to her, and further reassured me that I should not have the same problem on the return flight, despite the fact that it was also routed through Mexico City. Clearly, she remains uneducated!