The EuroSB project, that ultimately leads to Shadows of Europe (SoE), took Shadows of North America (SoNA) as a model. One of my main grievance against SoNA was the absence of details on north american corporations, like you had in New Seattle. Corporate Download gave a complete brief on the "Big Ten", but there were other corporations (like LOne Star or Federated-Boeing) who could be more important than those in some places. In SoE and later Shadows of Asia (SoA), a sub-chapter was dedicated to each continent local corporations. SoE also describe the European branch of each of the "Big Ten", making the setting easier to use for someone who didn't also read CDL (this wasn't carried on in SoA for a lack of space).

After the releases of SoE and SoA, the result was we had a summary of all the major European and Asian corporations, but no such things on the North America ones, while Seattle remained the center place of Shadowrun. There wasn't just a list of corporations benefitting from extraterritoriality, something that is not always made clear. That's what made me wrote, actually as soon as SoE was done and before SoA, a similar work, minus the collaboration with each country chapter authors (this being said, my work on SoA left little space to the other authors contribution, considering the amount of existing material on Asian corporations to take into account).

For Pour Ares Macrotechnology, Cross Applied Technologies and Novatech, I had to sum in a single paragraph everything you need to know on corporations whose almost every sourcebook provide new details. Other corporations like Lone Star are well-known, but some key information less so ; in LSSS case, the fact it replaced the Drug Enforcement Administration, according to the Lone Star sourcebook, had (that point was later dropped/forgotten in Ghost Cartels, with the DEA still around, which also compromise parts of my Cascade Plan).

After the Neo-anarchist Guide to North America described Cord Mutual, that company never showed up again. On the other hand, the DocWagon corporation was supposedly headquartered in the same town of Atlanta and got no mention at all. Considering insurance and medical services were related, I merged the two companies. "DocWagon" remains the advertised brand, and the by far the biggest revenue of Cord group. I usually prefer scratching my head a bit and coming up with some elaborated stories, rather than justifying an old sourcebook can be wrong or incomplete. Things that seem contradictory on the surface is food for thoughts, and result in more complex, and thus (IMO) much closer to reality.
There was a large number of major North American corporation showing up in Shadowrun once ot twice, and then never to be seen again. Instead of multiplying that kind of corporations without a decent amount of background to build upon, I often merged companies that could as well remained independant. NAN SB Volume 1 mentionned Hyundai-IBM in Armong, NY (where IBM headquarters historically is), and it was probably in the author's intent supposed to be among the best computer system in the world. Since Hyundai had a wholly different fate in the Korean section in SoA, and Hyundai-IBM never showed up again, I simply turned it into a laboratory belonging to Prometheus Engineering. Concerning Prometheus Engineering, I also took care of not contradicting the material from a fellow French website, Pénombre. Though what he wrote on that corporation is not exactly my cup of tea and my kind of game, I thought it was a better to allow people to use both. Note all of this was written before the Manhattan sourcebook got out, with Prometheus and Trans-Orbital returning.

Trans-Orbital suffered verious fate from one sourcebook to another. It also appeared for the first time in the Neo-anarchist Guide to North America as a member of New York corporate council. In Year of the Comet, it was one of the space race players, with its own launch site on Matagorda Island, Texas, and it also more or less suggested it had AA extraterritorial status. And in Target: Wastelands, it was now only a single A with some offices and factories and a space station, and no launch pad, forced to use Novatech and Proteus ones.
I started linking Lockheed to Trans-Orbital because the first wasn't to be seen anywhere in Shadowrun space industry, which was really far from reality. And Trans-Orbital, considering its size according to T:WL needed to have quite a few suppliers standing behind them.
I didn't write about it in this file, but I also imaginated a story to explain what happened to Matagorda Island launchpad, considering this island would be very close to the Texas-Aztlan border (thought "front line" might be more appropriate...). By manipulating both sides, a third force (say, Saeder-Krupp) could trigger a military escalation. A concentration of military forces on alert in the area could force Trans-Orbital to delay launchs, by the sole increase of their insurance premiums.

One last word on one of Shadowrun oddities, which had my brain running : Boeing is now called "Federated-Boeing". Searching for a way to give it sense, I finally found there was an US financial group called "Federated". I have yett find how to turn this into really interesting plot points. It should at least come into play with the Cascade Plan.