It's ATL-GIG that's listed at $2100, not JFK. Yes, it's still silly, but then so is DTW-AMS for $1538. It's just standard hub-hostage "sale" pricing. I'd expect every FT'er is familiar with the re-positioning routine for better prices.
The domestic fares initially looked pretty good, but they screwed up and listed the one-way fares as roundtrip. They have now corrected the web page and are showing the RT fares which are far less appealing.
I was wondering why I couldnt find the "special" price. Those were specials until they made it one way pricing.