I pulled up KeithGuys $377 itin:

MAY10 CO0749 SFO-EWR DEP 2200 ARR 0556+1
MAY11 CO0211 EWR-IAH DEP 0755 ARR 1052
MAY11 CO0073 IAH-HNL DEP 1220 ARR 1525

MAY13 CO0072 HNL-IAH DEP 2115 ARR 0950+1
MAY14 CO1749 IAH-SEA DEP 1200 ARR 1444
MAY14 CO8085 SEA-ANC DEP 1650 ARR 1919
MAY14 CO5844 ANC-MSP DEP 2150 ARR 0601+1
MAY15 CO5742 MSP-DTW DEP 0655 ARR 0944
MAY15 CO5345 DTW-SFO DEP 1200 ARR 1413

Amazingly only one segment is in a lower fare class (B), while the others are H, K, or Y. Too bad I'm living in the UK for the next six months or I would be all over this.