An FAA spokesman said the King Air was still at least 1,400 feet higher than
the 777, and its pilot claimed that
he was aware of the location of the British Airways jet.

I've been told by the FAA at safety seminars (pertaining to the NY
Bravo) that if a nearby plane climbs or descends more than 500 fpm, it
triggers an RA much farther away than a near miss would. Perhaps that's
what happened?

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.