I looked out of my window as we approached Mexico City and framed there, I saw Iztaccihuatl and Popocatepetl, gleaming white in the brilliant blue sky. The pilot turned in a wide arc and flew us straight down Avenida Reforma, past Chapultepec Castle, right above the Monument to the Revolution. I could even see the gold wings of the Angle of Independence as we flew above it. Dave and I arrived in Oaxaca at twilight, the beautiful . . .