As I drew DFW, I learned that terminals A, B, C, and E were not quite as similar as I originally thought. D (as the newest terminal) is very obviously different, but I’d assumed the other four were all basically similar half-circles. Instead, I found that C and E were actually very slightly elliptical, while A and B did indeed appear to be circular.
Additionally, I’d assumed that the Skylink train stations (highlighted in black) on all terminals except D were symmetrical and in the same position on each terminal. That turned out not to be the case. Each terminal had its stations at a different distance from the center of the terminal’s circle (essentially, the stations stuck out more from some terminals than others) and in the case of Terminal A, even the two stations on the same terminal stuck out different distances. Terminals B and C were vertically symmetrical in their placement of stations (the stations were at the same angle from the center of the terminal’s arc), but A and E were not.
DFW certainly has one of the most recognizable terminal shapes, so it was a neat one to create.
Paul Bogard created these terminal silhouette illustrations, and has made them available for use under a CC BY-SA 4.0 License.