This 1943 map uses Walter G. Gingery’s patented unfold-a-globe-into-six-gores projection, radiating from the true center of the world: Chicago. Just as Mercator’s rhumb lines helped marine navigation, this projection works for air travel as great circle routes are represented by straight lines. The map includes a measuring tape pinned to the center to let the reader estimate their own air mileage.
You can use the Gingery projection in your D3 map thanks to Philippe Rivière: https://github.com/d3/d3-geo-projection