One week advance I fares are $493 on this route.
Not sure where'd you seeing that, when I select I & higher on the advanced search, all I get are D fares @ $700. In any case, corporate policy disallows me from booking business / first class, but apparently has no problem with full fare economy.
Still, checking my receipts from the last 3 weeks, definitely was flying B fares all over the place around 475-525.