Ark. Code Ann. § 26-55-404

The owners or operators of motor buses operated on designated streets according to regular schedules, under municipal franchise, who for the purpose of operating the buses shall use motor fuel on which the tax, as imposed by the Motor Fuel Tax Law, § 26-55-201 et seq., has been paid or hereafter shall be paid, shall be entitled to a refund of the full amount of the motor fuel tax, subject to the provisions of this subchapter.