Dublin Airport's new noise regulator has been left with its first and only case unresolved after six months.
The regulator, the Airport Noise Competent Authority (ANCA), is in protracted correspondence with the Dublin Airport Authority (DAA) over the amount of information it needs to make a determination on the noise implications of DAA plans to increase passenger numbers from 32 million a year to 35 million.
In the meantime, the planning authority, Fingal County Council, cannot decide whether to approve or refuse the increase in passenger numbers until it knows the ANCA's views.
Latest correspondence between the sides revealed the DAA has asked for a six-month extension to come up with the noise assessments which the ANCA is demanding.
But the ANCA is seeking numerous reports from the DAA by March 31 before deciding whether or not to grant the extension.
The ANCA, which came into operation last September with an anticipated €1.9m budget for 2020, must assess all planning applications in and around Dublin Airport and apply restrictions if they are likely to increase noise beyond permitted levels.
The DAA is facing a growing number of noise complaints from the public, typically more than 1,000 each year.