Yes, all domestic flights in North America are Seattle to NYC.

With the current level of train infrastructure and service, I agree with you. That is why domestics flights are a thing. But trains would be a much better choice if rail wasn’t actively defunded and sabotaged for the last 70 years or so.

Its this lack of imagination of what could be (and already exists around the world) that makes everyone laugh at Americans.

Domestic flights should basically not be a thing. Trains should be the default option if you don’t have to cross an ocean.