I still hold out hope that FlixBus* will improve cycletouring options in America. From their website:
https://www.flixbus.com/service/bike-travelCan I take my bike on the bus?
Yes, you can! Bikes are allowed on most FlixBuses, so you can experience great adventures wherever you want. Many buses in our fleet have a bike carrier at the back of the bus that allows you to transport your bike or are equipped with special bike covers, which ensure a safe transport in the baggage compartment of the bus.
When adding a bike in the booking process, all reservable trips will be carried out by a bus equipped with a bike carrier or with bike covers.
Uh, but here's the kicker (without going into details of where the kick is placed): I scheduled a half-dozen hypothetical trips, and all of them had upgrade options to reserve a particular seat, sit next to an empty seat if possible, add additional "bulky" baggage and purchase a carbon offset for your trip (!) - but none had "Add Bicycle". Well, maybe this is something they're working towards in the future - or maybe an intern just copied and pasted info off their European website.
*Not schilling for these cats, but as I said in post no. 36, "
AmTrak serves 516 destinations. Airlines with scheduled service go to 503." Flixbus/Greyhound service ~3500 US destinations, and you can get your luggage at every one. It just seems like this would be beneficial for American cycletourists if it could evolve into a decent service.