Standard & Poor's Ratings Services said that it does not expect to revise its ratings on Irish airport operator Aer Rianta (A+/Positive/A-1) following today's announcement by the Irish Minister for Transport inviting proposals for the construction of an independent airport terminal at Dublin. The announcement is preliminary in that the invitation is designed to allow the Irish government to assess interest in the project and enable progress toward the formal public tendering process. There are no details about where the terminal will be constructed, or which airlines it will serve. The potential impact on Aer Rianta cannot therefore be assessed at this stage. Low-cost carrier Ryanair, which provides a large proportion of Aer Rianta's traffic at Dublin, has been pressing