Okla. Stat. tit. 68, § 68-6002: Levy of tax - Interest

Beginning on and after July 1, 1984, there shall be levied an

excise tax of three and one-fourth percent (3 1/4%) of the purchase

price of each aircraft that is to be registered with the Federal

Aviation Administration, upon the transfer of legal ownership of any

such aircraft or the use of any such aircraft within this state.

The excise tax levied pursuant to the provisions of Sections 6001

through 6004 of this title is in lieu of all other taxes on the

transfer or the first registration in this state on aircraft,

including optional equipment and accessories attached thereto at the

time of sale and sold as a part thereof, except annual aircraft

registration fees. The tax hereby levied shall be due at the time

of the transfer of legal ownership or first registration in this

state, and shall be collected by Service Oklahoma at the time of the

issuance of a certificate of registration for any such aircraft.

The excise tax levied pursuant to the provisions of this section

shall be delinquent from and after the twentieth day after the legal

ownership or possession of any aircraft is obtained. Any person

failing or refusing to pay the tax provided for in this section on

or before the date of delinquency shall pay, in addition to the tax,

a penalty of ten percent (10%) on the total amount of tax due.

Interest shall be collected on the total delinquent tax at the rate

of one and one-fourth percent (1 1/4%) per month from the date of

the delinquency until the tax is paid.