892 ' LAWS OF MARYLAND. [CH. 760

(2) An aircraft which is owned by a non-resident of
this State who is lawfully entitled to operate such aircraft
in the State of his residence;

(3) An aircraft engaged principally in commercial fly-
ing constituting an act of interstate or foreign commerce;

(4) An airman operating military or public aircraft, or
any aircraft licensed by a foreign country with which the
United States has a reciprocal agreement covering the
operation of such licensed aircraft;

(5) Persons operating model aircraft nor to any person
piloting an aircraft which is equipped with fully function-
ing dual controls when a licensed instructor 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;

(6) A non-resident operating aircraft in this State who
is lawfully entitled to operate aircraft in the State of
residence;.

(7) An airman while operating or taking part in the
operation of an aircraft engaged principally in commercial
flying constituting an act of interstate or foreign commerce.

(c) Exhibition of License and Certificates. The Fed-
eral license, certificate, or permit, and the evidence of re-
cordation in this or another State, if any, required for an
airman shall be kept in the personal possession of the air-
man when he is operating within this State and must be
presented for inspection upon the demand of any passenger,
or any peace officer of this State, any authorized member,
official, or employee of the Commission, or any official,
manager or person in charge of any airport in this State
upon which he shall land, or upon the reasonable request
of any other person. The Federal aircraft license, certifi-
cate, or permit, and the evidence of recordation in this or
another State, if any, required for aircraft must be carried
in every aircraft operating in this State at all times and
must be conspicuously posted therein where it may readily
be seen by passengers or inspectors and must be presented
for inspection upon the demand of any passenger, any
peace officer of this State, any member, authorized official,
or employee of the Commission, or any official, manager,
or person in charge of any airport in this State upon which
it shall land, or upon the reasonable request of any person.

(d) Air Instruction without License or Certificate Un-
lawful. It shall be unlawful for any person to operate an
air school or to give instructions in flying in
this State unless such person has an appropriate
effective license, certificate or permit issued by the United