From the runway up to three thousand feet, the terminal airspace over Mexico City holds more than a third less usable room than New York's. Each box is a shared cluster, not one field: New York works Kennedy, Newark and LaGuardia inside it; Mexico City works Benito Juárez, Toluca and Santa Lucía. Same 40 NM box and 11,000 ft ceiling over each, so terrain is the only variable: over New York the cylinder is nearly full air, while Mexico City's mountains fill the bottom. Drag to rotate; the vertical is exaggerated for legibility (true scale is nearly flat; slider below).