What actual infrastructure are these listed airports developing? Apart from bigger parking stations and new food courts?
Precisely nothing. Nor did the ever vigilant governments care to include any such requirement in the fire sale of public infrastructure.
With Transurban currently posturing to control Australia's roads, A case in point is the Cross city tunnel (in Sydney) A cost benefit model showed conclusively if the NSW government had issued the bonds, built it, tolled it and paid it off the taxpayer was over $1.5 billion better off. However private consortium handsomely reward duplicitous politicians and civil servants, just ask Max Moore- Wilton. it is important to remember that Governments only understand whom they serve when lining up to hang from lamp posts..
When the privatised UK Air Traffic control, cleverly called a "private-public partnership suffered a decline in revenue post 911 Attacks, guess who was on the hook for additional money to make whole the 51% private owner's loss? The UK taxpayer!
Exactly the same template when Sydney Airport suffered a down turn the almighty ACCC allowed SACL to increase charges belong the previously agreed limits as their revenue had deteriorated.