https://www.google.com/flights/#sear...AA2407;a=AA,KE

Perhaps not exactly MR since it requires at least 4 night stay, 3 nights stay at $740. Good for people looking for nice ICN fares from BOS. Limited dates until early December.

BOS-ORD-PEK, ICN-DFW-BOS on AA 15,848 mi, 3.8cpm
PEK-ICN on KE 562 mi (did not count as cpm)

Selecting multiple airlines on Google Flight sometime gives interesting options!