What about in the court of common sense? Let's say, hypothetically, Mr/Ms. older & high time has a suitable trust fund and wants to fly for regional money, because the base is good for him/her. Passed over for a younger less qualified person. This is in effect saying when given the choice the regional prefers to hire less experienced pilots. Who knows? Maybe that would be part of their advertising (no, I know they don't advertise). "Fly us! We can hire experienced pilots but we hire the least experienced pilots and pay them dreadfully low wages. Book Now!"

The charade of regional flying should be well known, but it is always covered up. Virtually no regional advertises (again that was an example) because they don't have to, they are nestled with major contracts. They can also say a more experienced person will leave as soon as they can, to avoid the potential age discrimination lawsuit, but then so will anyone else.