So now we know why SK started flying to JFK again after 35 years........ Interesting to see what happens to the IAD flight. My feeling is that SK started flying there in 2001 because of UA's expansion at IAD in the 1990s. At the time EWR did not offer good *A connections before the UA/CO merger. Today all the destinations in the US are *A/UA hubs........ well, not BOS but that's all O/D traffic.
Logically, they would switch IAD with ATL. Uggh. MSP or DTW for ORD is a tough one. Tier 1 airport subbed with tier 2?