The Labour Party has called on the Government to publish any advice sought from the Attorney General on the plan to break up Aer Rianta.
The call follows reports that the company could be forced to pay back nearly €500 million in loans and bonds immediately as a result of the Government's restructuring plan.
The company has written to the Department of Transport expressing concerns that the break-up could leave the company in default under the terms of its loans.
Labour's transport spokeswoman, Ms Roisin Shortall, said concerns raised about Aer Rianta's debt position was further evidence "that the whole project has never been fully thought through".
Ms Shortall said: "Clearly the disclosure that, should the break-up go ahead, bondholders could regard Aer Rianta as having defaulted on the debt has added to concerns among the workforce about the security of their jobs.
"I assume that legal advice of the Attorney General will have been sought on this matter and I believe it is essential that we should know if he shares the concerns of the company," she said.
Ms Shortall said any legal advice should be made available in advance of the Seanad debating the issue tomorrow.
In a letter to the Department of Transport on June 30th, the Aer Rianta's chief executive, Ms Margaret Sweeney, said the Government's plan could leave the company insolvent.
She contended that lenders' approval should be got before the Minister for Transport, Mr Brennan, makes any attempt to break up the company.
Her warnings came as the former minister for public enterprise, Ms Mary O'Rourke, warned that the Government's legislation was premature and poorly drafted.
