Actually, it's now working for all flights into Budapest (including from Europe). Looks like they're shooting for the whole ball of wax.

Hm. JFK-FRA works, JFK-SIN doesn't. SFO-(AKL|SIN|BKK|BJS) don't, JFK-WAW doesn't, DEN-MEX doesn't, JFK-YYZ doesn't. So, US-US, US-Western Europe, US-Australia. Strange dataset.

Well it only has nonstop flights, so JFK-SIN shouldn't work (afaik no aircraft has that range). Likewise SFO-SIN, SFO-BKK.

SFO-AKL has direct flights though. I know, I've done it. NZ8. Nice plane.

edit: Actually I checked and "sfo to akl" does in fact give me results.

And I'm just coming back to this thread because I learned something today. There are no flights from Singapore to JFK, but there is one to Newark. It's the longest scheduled air route in the world, at 18 hours and 40 minutes.

Oh, and it's in a 100-seat all-business-class A340-500. I'm guessing they couldn't do it with a fully-laden economy section. Then again I'd hate to fly 19 hours nonstop in economy.