From the window, the urban sprawl of Mexico City appears through the dense cloud. It is not a rain cloud that we break through, but thick pollution. Welcome to Mexico City, the largest city in the world. The wheels screech as the pilot seems to forget that this is a million dollar piece of equipment. I remove the wheel arch from beneath my seat and make my was down the jet way. After the 11 hour layover in Lima Peru and the 6 hour flight, it was nice to finally stretch my legs. The memory of the last two hours of our flight came flooding back as I remind myself to write a politely worded email...