"Dudley Henriques" wrote

AOA is optional equipment for GA and I understand the airlines have
done a study on it's use in large aircraft.

Most of us joining PanAm during, or just after Vietnam, had considerable
experience flying AOA and couldn't understand why the latest jetliners
were not so equipped. It soon became obvious that ALPA and the old WWII
bomber captains that it represented wanted nothing to do with modern
technology. This group rejected CVRs, GPWS, AOA and anything else that
would have required them to be retrained.

This group of pilots are held in high esteem by almost everyone except
those of us who had to fly with them. They had received minimal training
for their B-17 or C-47 job in the Airforce and only through the strength
of the union, barely made it through the jet transition.

They still (1960's) would fly a "raw data" ILS instead of using the flight
director. Most of them had no business in a jet airplane. PanAm crashed
a large number of their B-707s due to pilot issues.

Bob Moore