In July-ish 2020 I was the only person in the JFK T4 B skyclub... this was the entirety of the departures board that afternoon:


Back on topic though - flew MSP-ICN this summer and was one of 4 passengers in D1 (although after standbys cleared the cabin was half full); not the worst thing since my seat recline was broken and they were able to move me to another true window seat