Ok, thanks DR and JW.
The topic came up in a debate about how close to AOA that the aircraft's pitch attitude minus flight path vector is. Someone pointed out that (pitch attitude + angle of incidence) - flight path vector would be close to an actual AOA value, but we were unsure how wing washout etc would affect the AOA value. I guess it is not so simple on a big, complex wing, which is why we are taught that pitch attitude - flight path vector is an "indirect indication" of AOA.
Apologies for not finding it on my own searches. I guess my error was omitting the term "wing". Simply searching for "747 angle of incidence" was insufficient.