Wow, TIL near where I grew up in France, high-speed rail (the TGV) caused tangible reduction in passenger air traffic. The budget airlines shut off the routes as soon as the TGV started running, unable to compete. The larger airlines kept trying for ten years, but eventually gave up as well. Turns out, 2-3 hours on a comfortable train that drops you in the middle of town is better than faffing around in airports, despite the trip time being just 1h.
Just a thought, North America.