Harbor Diversified (HRBR) 10-K 2021 FY Annual report

Exhibit 4.2

DELAWARE SEAL 1992 CORPORATE HARBOR DIVERSIFIED, INC. CHIEF EXECUTIVE OFFICER AND SECRETARY AUTHORIZED SIGNATURE TRANSFER AGENT AND REGISTRAR (Brooklyn, NY) AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC BY COUNTERSIGNED AND REGISTERED: transferable on the books of the Corporation by the holder hereof in person or by duly authorized attorney upon surrender of this certificate properly endorsed. This certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar. WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers. Dated: FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $0.01 PAR VALUE, OF Harbor Diversified, Inc. Harbor Diversified, Inc. is the record holder of This Certifies that SEE REVERSE FOR CERTAIN DEFINITIONS CUSIP 41150R 10 2 INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE SHARES

THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15. By Signature(s) Guaranteed THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER. NOTICE: XX Dated to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises. Attorney of the common stock represented by the within Certificate, and do hereby irrevocably constitute and appoint Shares (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE) PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE FOR VALUE RECEIVED, hereby sell, assign and transfer unto Additional abbreviations may also be used though not in the above list. UNIF TRF MIN ACT – ............... (Cust) (State) (Minor) under Uniform Transfers to Minors Act UNIF GIFT MIN ACT – Custodian (Cust) (State) (Minor) under Uniform Gifts to Minors Act TEN COM — as tenants in common TEN ENT — as tenants by the entireties JT TEN — as joint tenants with right of survivorship and not as tenants in common The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: THE SECOND AMENDED AND RESTATED CERTIFICATE OF INCORPORATION, AS AMENDED (THE “CERTIFICATE OF INCORPORATION”) OF THE CORPORATION CONTAINS RESTRICTIONS PROHIBITING THE TRANSFER (AS DEFINED IN THE CORPORATION’S CERTIFICATE OF INCORPORATION) OF ANY STOCK OF THE CORPORATION (INCLUDING THE CREATION OR GRANT OF CERTAIN OPTIONS) WITHOUT THE PRIOR AUTHORIZATION OF THE BOARD OF DIRECTORS OF THE CORPORATION (THE “BOARD OF DIRECTORS”) IF SUCH TRANSFER AFFECTS THE PERCENTAGE OF STOCK OF THE CORPORATION (WITHIN THE MEANING OF SECTION 382 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE “CODE”) AND THE TREASURY REGULATIONS PROMULGATED THEREUNDER), THAT IS TREATED AS OWNED BY A FIVE PERCENT STOCKHOLDER UNDER THE CODE AND SUCH REGULATIONS. IF THE TRANSFER RESTRICTIONS ARE VIOLATED, THEN THE TRANSFER WILL BE VOID AB INITIO AND THE PURPORTED TRANSFEREE OF THE STOCK WILL BE REQUIRED TO TRANSFER EXCESS SECURITIES (AS DEFINED IN THE CERTIFICATE OF INCORPORATION) TO THE CORPORATION’S AGENT. IN THE EVENT OF A TRANSFER WHICH DOES NOT INVOLVE SECURITIES OF THE CORPORATION WITHIN THE MEANING OF DELAWARE GENERAL CORPORATION LAW (“SECURITIES”) BUT WHICH WOULD VIOLATE THE TRANSFER RESTRICTIONS, THE PURPORTED TRANSFEREE (OR THE RECORD OWNER) OF THE SECURITIES WILL BE REQUIRED TO TRANSFER SUFFICIENT SECURITIES PURSUANT TO THE TERMS PROVIDED FOR IN THE CORPORATION’S CERTIFICATE OF INCORPORATION TO CAUSE THE FIVE PERCENT STOCKHOLDER TO NO LONGER BE IN VIOLATION OF THE TRANSFER RESTRICTIONS. THE CORPORATION WILL FURNISH WITHOUT CHARGE TO THE HOLDER OF RECORD OF THIS CERTIFICATE A COPY OF THE CERTIFICATE OF INCORPORATION, CONTAINING THE ABOVE-REFERENCED TRANSFER RESTRICTIONS, UPON WRITTEN REQUEST TO THE CORPORATION AT ITS PRINCIPAL PLACE OF BUSINESS. The Corporation shall furnish without charge to each stockholder who so requests a statement of the powers, designations, preferences and relative, participating, optional or other special rights of each class of stock of the Corporation or series thereof and the qualifications, limitations or restrictions of such preferences and/or rights. Such requests shall be made to the Corporation’s Secretary at the principal office of the Corporation.