Ryanair said this evening it had lodged papers in the High Court challenging a decision by planning authorities to give the go-ahead for a second terminal in Dublin airport.
The airline said it was seeking a judicial review of An Bord Pleanála's decision and the decision by the Commission for Aviation Regulation (CAR) to allow the Dublin Airport Authority (DAA) to increase passengers' charges to help pay for the multi-million euro project.
An Bord Pleanála granted permission last month for the first phase of a second main terminal at the airport and approved the construction of a new runway subject to stringent conditions.
At the time Ryanair said the DAA's "gold-plated" terminal would lead to "a doubling of the already high passenger charges" and vowed to challenge it.
In a statement today, the carrier said: "These two applications for the High Court to judicially review the decision of An Bord Pleanála approving T2 and the CAR's decision allowing the DAA to recover the inflated costs of T2 are aimed at preventing further passenger charge increases and inefficiency at Dublin airport
"The basis of both of these legal challenges is that the T2 facility as proposed by DAA is massively oversized, as CAR has now confirmed; it costs approximately four times what it should and will double passenger charges at Dublin airport," Ryanair claimed.