An Taisce is calling for a 'major reduction' of car parking space at the airport
The DAA is labelling claims by An Taisce that its planning application is going to increase congestion on the M50 as 'rather bizzare'.
It says it will not result in a single extra car parking space.
An Taisce is opposing the authority's application to continue having almost 11,000 long-term car park spaces - claiming it would "perpetuate current unsustainable levels of traffic".
The heritage body says the amount of car parking space is causing gridlock on the M50.
The organisation is instead arguing that the focus should be on improving public transport to Dublin Airport instead.
To achieve that, An Taisce is calling for special buses and traffic management.
It also wants to see higher parking charges to fund public transport, and has raised concerns about the environmental impact of heavy use of private cars.
An Taisce's Ian Lumley said that the DAA should be facilitating better public transport links.
He observed: "There is an issue certainly for very early flights, but there are quite a number of bus services that are timetabled to meet those early morning flights.
"Dublin Airport Authority should be working out the routes where people come from, and facilitating more of those connecting buses."
Mr Lumley added: "Dublin Airport was given temporary permission for over 8,000 car parking spaces - only temporary on the basis that Metro North would be completed by now. That hasn't happened.
"Metro North could be ten years away. In the meantime, what's needed is enhanced bus provision to Dublin Airport."
But DAA chief communications officer, Paul O'Kane, said they only want to make them permanent.
"What this application is seeking to do is change the exisitng planning status of this long-term car park.
"It's currently got a temporary planning permission, and we want to change that to permanent.
"We're not building a singe extra space and there are no extra actual works required.
"And also when you look at the busy time at Dublin Airport: our busiest time of the day is between 6am and 7am every day.
"That creates demand on the M50 at about 5am, which is well in advance of the morning rush hour".