Constituting the Fifteenth Supplemental Ordinance to the Amended and Restated General Airport Revenue Bond Ordinance; authorizing the Mayor, the City Controller and the City Solicitor, or a majority of them, to issue and sell one or more series of tax-exempt or taxable Airport Revenue Bonds or Notes of the City of Philadelphia; setting forth the use of proceeds of such Bonds or Notes; determining the sufficiency of pledged Amounts Available for Debt Service; covenanting for the payment of interest and principal; authorizing the Bond Committee to take certain action with regard to the terms an — Open Common Ground