At Immigration: Scanned, no, Photographed, yes. (So depending on your definition)

At TSA, They scan the first page of passport (or local ID) and usually Full body scan. So in the strict sense of facially scanned no.

At the gate (until now), neither. They would scan the boarding pass and eyeball the passport if international.

Again the point here is that in the first two instances these are Government agencies doing the scanning. At the third, the Government no longer has anything to do with it.

The question with this stuff is how and where are Airlines (private companies) getting a database of biometric data and what are they doing with it?