He was appointed chairman of the board of Aer Rianta in 1990 under the Charles Haughey government, but resigned in October 1991 amid the scandal over the purchase of the Johnston Mooney & O'Brien site by Telecom Éireann.
According to the Glackin Report, Hoddle Investments (the vehicle through which the deal was handled) executed two contracts with Telecom Éireann for the sale of the Johnston Mooney & O'Brien site for an aggregate price of £9.4 million, on 7 May 1990. The proceeds of the sale were lodged to an NCB account.
According to the Moriarty Tribunal report, the next day, on 8 May 1990, £206,613.57 was withdrawn from one NCB account, converted into sterling £200,000 and transferred to the Aurum Nominees No.6 account at NCB (proxied to an offshore Ansbacher Cayman account) held for the benefit of then Taoiseach, Charles Haughey. Aurum Nominees Limited was a company established by NCB for the benefit of its clients, and used at the time by several of the beneficiaries to the deal, including JP McManus, Lochlann Quinn and Martin Naughton. Mr Quinn and Mr Naughton were owed money by Mr Desmond and he used the proceeds of the sale to pay off his debt to them, according to the report.