Because I'm crazy, I thought that was a requirement for Flyertalk .

The real reason is, I HATE redeyes and the SLC-JFK Nonstop is a redeye. David are you listening??? NO MORE REDEYE ONLY CITIES!!!! JetblueFA next time you see him maybe you can slap some sense into him. When people look at a route like JFK-SLC, JFK-PDX, JFK-SMF. And they see 1 flight each way (westbound late evening eastbound redeye), most people get turned off by it, which is probably why they stay 1 flight markets due to lack of demand.
</rant off>

Also, question does JFK-SEA only a seasonal (summer) 2X nonstop? My brother had to go to SEA last month and he told me that he didn't fly B6 because of the time (late evening/redeye). He ended up roughing it with CO.