I log into NA servers from Europe. And my ISP (Telfort) does not have a counterpart in North America, I checked. And I am also experiencing difficulties. So to blame NA ISPs might be a bit presumptuous. Just telling this so you know this and can add it into the investigation. Considering the Lodestone:

"Based on our investigations, there is a high likelihood that these issues are occurring at the North American upstream Internet Service Providers, which is affecting the internet pathways and resulting in abnormal connections."

But I log into NA from The Netherlands with a Dutch (or at most European) ISP so it can't be the ISPs of NA only, there has to be something with the server as well. Hope this gets solved quick as people pay to play and many are now being kicked offline if they can log in at all.