Ryanair wants an end to "repeated delays" in the delivery of a second runway at Dublin Airport.
It's asking the Attorney-General's department to speed up legislation, so the Irish Aviation Authority (IAA) can monitor noise regulation.
The airline says the runway "is critical to the continued growth of air travel to and from Ireland", especially in the run up to and after Brexit.
Ryanair chief Michael O'Leary says: "Ryanair is unable to base additional aircraft at Dublin because there are no spare slots in the early morning for additional departures.
"The fact that this statutory instrument has been repeatedly delayed in the Attorney-General's office for over 12 months is unacceptable."
An Bord Pleanála gave the airport permission to build the 3,110 metre runway in 2007 - but it was put on hold because of the economic downturn.