RMIT planning academic Michael Buxton has written widely about airports and their interaction with surrounding housing, offices, shopping centres and industrial businesses.
He said on Tuesday morning that the privatisation of Australian airports had led to their new owners realising they could make "packets of money" by building on vacant land around them.
"But it has placed thousands of people at risk," said Professor Buxton. "It should never have been allowed."
Federal airport land is controlled by the Commonwealth government, which privatised them between 1997 and 2003.
Professor Buxton said that the Essendon Airport DFO was "one of the most extensive commercialisations of any airport in Australia and it has put thousands of people daily within the airport boundaries".
He said the privatisation of airports had been seen as "a huge opportunity" by their new owners. "And no-one prevented it; state governments have been opposed to it, but they have never opposed it strongly enough. Local governments have, but it's more on the basis of [these new retail outlets] competing with shopping centres," he said.