In the past I know the US would let you add an extra stay at a hub. A routing such as CRW-PIT-SFO-PIT-CRW with an extra long layover at PIT either way is an example.
You cannot book these online, you have to call reservations and request such a reservation.
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A "Mileage Run"... is that what they're called? I've been doing them for years and didn't know they had a name.