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I booked the flight from PHL-MSP-SEA-MSP-PHL on Sep 12 first, then I can take A330 from MSP-SEA, and B742 from SEA-MSP.
But I am afraid of delaying in PHL-MSP segment, it was only one hour transfer time in MSP. So cancelled the original ticket and booked another one with Mileage Run
Sep 11, PHL-MSP-DTW-SEA
Sep 12, SEA-MSP-PHL
Sorry for Chinese remark only, but I bet everyone here can understand what I said even only through the photos I took that day.