Originally Posted by
EXDAC
He only says that the pilot should have a purpose for making the flight other than carrying the cost sharing passenger. That would seem to imply that, back in 1992, the common purpose test was not well known.
I would say that in those few words, he pretty much nails a key aspect of the common purpose test. The flight had better not be for the sole purpose of taking the passenger to the destination.
Common Purpose as a test predates air travel, and owes its origins to much earlier forms of transport. It perhaps merits an AC in the same way as the 1986 example I gave above.