"Steven P. McNicoll" wrote:
"Maxwell" wrote in message
...

AC 90-66A, if you believe in such things.

Please cite them.

I believe the "definition" in that circular is implicit in the labeling of
the airport operation diagrams in appendix 1. The line out from infinite to
the point where it joins the base leg is labelled "straight-in approach"
and the narrative for point (3) labels the line from the base leg to the
runway as final.