Okla. Stat. tit. 3 § 61
Every municipal corporation within this state shall have the right and power to acquire, own, operate, improve and maintain, within or without the corporate limits of such municipal corporation, real estate, buildings, improvements and facilities for aviation airports and rights-of-way therefor. For such purposes every municipal corporation shall have the power to exercise the right of eminent domain within or without the corporate limits of such municipal corporation. For any and all of such purposes in order to carry out the same they shall have the power and authority to issue and sell bonds under and by virtue of the Constitution of this state, bearing interest not to exceed six percent (6%) per annum, maturing within twenty-five (25) years, and issued in the manner and form provided by law.
Okla. Stat. tit. 3, § 61