All contracts made by the department either as agent for the state, any municipality, or any airport authority shall be made pursuant to the laws of the state governing the making of like contracts; provided, that where the planning, acquisition, construction, improvement, maintenance, or operation of any airport, air navigation facility, avigation easement or the acquisition, lighting, marking or elimination of any airport hazard is financed wholly or partially with federal moneys, the department, as agent of the state, of any municipality, or of any airport authority, may let contracts in the manner prescribed by the federal authorities acting under the laws of the United States and any rules or regulations made thereunder.