I think it was CityNerd whose video I recently watched where one of the points was too many local flights still in Acela corridor.

Acela is the closest US has to a high speed train and connects cities with huge populations, transit and the right distance for hsr. It’s hugely popular and has taken many flights out of the air and cars off the road, but it’s not enough. It’s still the most congested airspace in the US and there are 450 flights/day between major cities within the Acela service area. Current Acela levels of service are way below what people are demanding and it’s not enough. Nowhere near enough. Those 450 flights every day entirely within the Acela service area shouldn’t exist. We need train service good enough to start banning local flights