If you check out the index of forums to the right, you’ll see “Looking For / Offering Rides” for 2022. Go ahead and post on there since it looks like folks are creating 2023 inquiries in that sub-forum. As we get closer to the ride there will be A LOT of folks better positioned to offer you a ride once they finalize their own plans. If those flights are getting full, I would say go ahead and book to either Omaha or Des Moines and keep trying to find a ride over the next 3-4 months. You’re bound to find someone.
And I would periodically check back in with those charters since some folks are bound to cancel their trip.
Side note: Might be a good idea for RAGBRAI staff to create a dedicated version of that sub-forum for the 2023 ride since most charters appear to be sold out already.