WM. PRESTON LANE, JR., GOVERNOR. 1011

(10) an individual piloting an aircraft which is equipped
with fully functioning dual controls when a properly certifi-
cated pilot is in full charge of one set of said controls and
such flight is solely for instruction or for the demonstration
of said aircraft to a bona fide prospective purchaser.

24. (Mechanics Liens—Aircraft. )

(a) Whenever any aircraft, or any part thereof, is left by
the owner or by any other person with his authority, express
or implied, in the custody of any corporation, firm, individual,
association or person, or in the custody of any of the operat-
ing personnel of any airport operated by the State, or any
county, city, town or village, for repair, rebuilding, mainte-
nance, storage, parking, handling, tie-down, inspection or for
furnishing any part, accessories, tires, appliances, gasoline,
oil, fuel or any other materials or supplies or services for or
on account of the same, or whenever any aircraft lands on
or otherwise uses any airport operated by any corporation,
firm, individual, association or person or by the State, or any
of the above mentioned political sub-divisions and thereby
incurs art obligation to pay a flight fee or other charge for so
doing, the corporation, firm, individual, association or person
or the State, or the county, city, town or village operating the
airport shall have a lien on said aircraft, or part thereof, for
any and all expenses or charges incurred for doing or furnish-
ing any or all of the aforementioned things to or for said air-
craft, or part thereof, or for permitting said aircraft to land
on or otherwise use such airport, and may lawfully retain said
aircraft, or part thereof, until all of said expenses or said
charges have been paid in full, or until said lien is extinguished
or discharged as hereinafter provided. Said lien shall be
subordinate only to the holder of a bill of sale, contract of
conditional sale, conveyance, mortgage or assignment of
mortgage for or on the aircraft, or part thereof, which has
been executed and recorded with the Administrator of Civil
Aeronautics or such other officer or agency of the Federal
Government which may hereafter from time to time perform
the duties and functions now being performed by the Adminis-
trator of Civil Aeronautics prior to the time when the said
lien became effective. Surrender or delivery of any aircraft,
or part thereof, which is subject to the lien aforesaid shall
operate as a waiver or extinguishment of the same as against
third persons without notice thereof, but shall not operate as
such waiver or extinguishment as against the owner or as
against third persons with notice.

(b) Should the owner dispute the amount of the charge, or
any part thereof, for which the lien is granted as aforesaid,