Following complaints by competitors, the European Commission launched a formal investigation into payments made to Olympic Airways Services SA and Olympic Airlines that could involve the illegal transfer of state aid. Among the measures under review are: non-collection of tax and social security debts to the Government, financing of aircraft leases, payment of damages arising from arbitral panel decisions; and special creditor protection granted under national legislation. The Commission's preliminary investigation has not resulted in any conclusive findings and therefore it has decided to undertake a more in-depth enquiry