14 C.F.R. § 45.21

General

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(a) Except as provided in § 45.22, no person may operate a U.S.-registered aircraft unless that aircraft displays nationality and registration marks in accordance with the requirements of this section and §§ 45.23 through 45.33.

(b) Unless otherwise authorized by the FAA, no person may place on any aircraft a design, mark, or symbol that modifies or confuses the nationality and registration marks.

(1) Except as provided in paragraph (d) of this section, be painted on the aircraft or affixed by any other means insuring a similar degree of permanence;

(2) Have no ornamentation;

(3) Contrast in color with the background; and

(4) Be legible.

(d) The aircraft nationality and registration marks may be affixed to an aircraft with readily removable material if—

(1) It is intended for immediate delivery to a foreign purchaser;

(2) It is bearing a temporary registration number; or

(3) It is marked temporarily to meet the requirements of § 45.22(c)(1) or § 45.29(h) of this part, or both.

[Doc. No. 8093, Amdt. 45-5, 33 FR 450, Jan. 12, 1968, as amended by Amdt. 45-17, 52 FR 34102, Sept. 9, 1987]

Notes of Decisions

Cited in 2 cases (1 in the last 5 years), 2016–2026 · leading case: United States v. Thompson, 197 F. Supp. 3d 143 (D.D.C. 2016).

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United States v. Thompson, 197 F. Supp. 3d 143 (D.D.C. 2016). “pdf (last visited June 15, 2016); see also 14 C.F.R. § 45.21 (a) ("[N]o person may operate a U.”

Hardwick v. FAA (5th Cir. 2026). “On April 27, 2020, the FAA suspended Hardwick’s pilot’s license for 150 days, finding he violated 14 C.F.R. §§ 45.21 (a) and 45.23(a) (requiring aircraft to display proper registered tail numbers), 91.”

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