The AIA............
I think it was originally started by Ag operators and then morphed into an industry wide organisation when the rest of the industry saw the benefits. Unfortunately AIA has become the voice of the larger players who push their barrow claiming to CAA, the pollies, and the public that they represent the whole industry. As a result there have been changes introduced with the claim that this is what industry wanted when in fact it is the desire of a few. In some cases these few within the industry have seen "market benefits" coming to them at the expense of smaller operators from some CAA proposals and have given "industry" support to these proposals.
If I remember correctly the AG operators became so disenchanted with AIA the broke away and set up their own separate organisation AAA.
The CAA..........
Inwards looking, totally focussed on rules without looking at the practical application of the rules. Ask some of the smaller Part 135 operators about the requirements for a Chief Pilot and where they will be able to find someone to meet these requirement, and the type flight time requirements that have to be met even for something like a C 172. You would think these operators were trying to run a B747.