Thanks for the advice! That’s exactly my plan, to check premium - I set up an Expertflyer alert to help me out. That’s great to know about your experience, and I was checking flights for my routings for a couple days later that showed premium being a $20 from ATL-SEA (something I’m sure a ton took advantage of).
Had extra wallet funds so I routed myself from ATL-ORD via SEA. If both are in Y... my privileged self will be regretting the routing! Thanks again for the tips.