Yes and no. Many other countries are using C-Band, but often under slightly different conditions. Some countries licensed frequencies that stop significantly fa

Yes and no. Many other countries are using C-Band, but often under slightly different conditions. Some countries licensed frequencies that stop significantly farther away from the spectrum used by radio altimeters. Some countries have mandated lower power levels for C-Band. Some countries have created larger exclusion areas around all airports (rather than the smaller, temporary exclusion areas around some airports in the US). Some countries have mandated a downward tilt for C-Band antenna panels (nationwide or in areas around airports) so that the transmissions aren't going go up as much (but a downward tilt also limits the transmission range which is bad for wireless carriers). I think one of the big things in the US is that anything that makes C-Band harder to work with makes it hard for 2 of the 3 wireless carriers to compete. T-Mobile has a lot of 2.5GHz spectrum that it has been using to launch high-speed 5G services. Verizon and AT&T had been waiting for their C-Band spectrum to be usable to launch their high-speed 5G services. In Europe, if all carriers are facing the same restrictions, it's a level playing field. In the US, if Verizon and AT&T face restrictions that T-Mobile doesn't face (for most of its spectrum since it's 2.5GHz and not C-Band), that doesn't offer a level playing field. I think it's also more contentious in the US because we have a much more suburban and rural population. Transmission distance is really important in the US because people expect to get modern services even in low-density areas. Verizon built its business on the idea that you should expect excellent wireless coverage even in places that have virtually no people. I think another part of it is that the FAA is often very cautious and it seems like they didn't coordinate well with the FCC in voicing their concerns early on enough. The FAA does have a web page on C-Band (https://www.faa.gov/5g https://www.faa.gov/5g) which is their official stance on the subject. They cite "Lower power levels, antennas adjusted to reduce potential interference to flights, different placement of antennas relative to airfields , and frequencies with a different proximity to frequencies used by aviation equipment" as reasons why the C-Band situation in the US is different from that in other countries. Is the FAA being too cautious? Maybe. Ultimately, no one wants their business plans disrupted. Airlines don't want to see issues that delay landings. Verizon and AT&T don't want to see things that delay their ability to provide fast 5G service.