For domestic look at ANC. I see JFK-MSP/SEA-ANC rt late March for $587. not the best MR ever at 8 cpm but you're right at 21 days from departure so the cheapest fares are gone.

You might also consider BUR or SJC but you'll need at least 2 connection each way to get to 7,200 MQMs.

Those three cities have been the place to start for me planning MR's out of NYC.