This is a little "off topic", but for those who don't know, there was a swathe of land taken from the South end of Parafield to allow the new road to go through.
For Parafield Airport Limited (PAL) to agree to the resumption of that piece of land for the road, the authorities (government) agreed to allow PAL to rezone a significant amount of land to Commercial/Industrial. It's in the SW corner of RWY 21 and RWY 26.
The stroke of a pen created a potential benefit to PAL of around $200M.
Not bad for an investment of about $10M, with the main beneficiary being (I believe) one of Adelaide's finest boy's School.