For such a small airport, ITO was actually rather difficult to draw. As a Hawaiian airport, a good portion of the terminal is outside but shaded, meaning there are a lot of holes in the roof—and thus a lot more edges on the silhouette. That said, it was perfectly symmetrical left-to-right, so I only had to draw half of the terminal, and then copy and flip it.
Paul Bogard created these terminal silhouette illustrations, and has made them available for use under a CC BY-SA 4.0 License.