Also, keep in mind that LAX - JFK is full of premium traffic with higher paying guests, and FC seats tend to go more quickly on this route. I don't think I have ever worked a LAX - JFK flight with any open FC seats. So if this is important to you, I would suggest logging in right at the 6-hour mark. Also, monitor seat availability for the next week or so....my educated guess is that most of those seats will get filled up.
Good luck
