Ryanair has launched a court challenge to the decision to approve the second terminal at Dublin airport.
Mr Justice Peter Kelly yesterday admitted into the Commercial Court list a judicial review challenge by Ryanair to the granting of planning permission for the terminal.
In separate proceedings, also admitted to the Commercial Court list, the airline is challenging the Commission for Aviation Regulation's decision to allow the majority of the Dublin Airport Authority's (DAA) costs for the new terminal to be recovered through higher passenger charges.
In papers lodged in court, Ryanair's solicitors said there is an urgency to the matter and it was in everybody's interest that the position in relation to Dublin airport and especially the building of a second terminal was clarified as soon as possible.
An Bord Pleanála gave permission in August for the first phase of a second main terminal at the airport and approved the construction of a new runway, subject to strict conditions - including banning flights between 11pm and 7am and limiting night-time flights
It its challenge, Ryanair claims the permission relates to development of a second terminal at a cost, it alleges, of €800 million.
It says the terminal development is part of a greater infrastructural investment plan for Dublin airport, said by the DAA to be valued at €2 billion.
Ryanair is alleging the decision of An Bord Pleanála was "unreasonable and irrational" and that the board exceeded its jurisdiction by increasing the ceiling of 30 million passengers per annum by some two million passengers.
An Bord Pleanála had failed to accord with proper planning and development , it also claims.
The DAA says the new terminal will cost €350 million, rather than the €800 million Ryanair claims.