Oregon Revised Statutes Aviation § 837.005

(1) Aircraft owned by any person, firm or corporation and certificated by the appropriate federal agency for domestic or foreign scheduled air commerce;

(2) Military aircraft of the United States of America;

(3) Aircraft licensed by a foreign country with which the United States has reciprocal relations exempting aircraft registered by the United States, or any political subdivision thereof, from registration within such foreign country; or

(4) Classes of aircraft designated as exempt by rules adopted by the State Aviation Board.