STC ST11270DS

Number: ST11270DS

This certificate issued to: American Airlines, Inc.

Maintenance and Engineering (M&E) Division 3900 North Mingo Road, MD 537/TUL Tulsa, Oklahoma 74116

Part 25 of the Title 14, Code of Federal Regulations (CFR).

Original Product Type Certificate Number: T00001SE Make: The Boeing Company Model: 777-323ER Description of Type Design Change: Modification of the passenger cabin of the Boeing 777-323ER aircraft to install new business class seats, new premium economy seats, new economy seats, new class dividers, new and modified closets, new and modified galleys, new and modified lavatories, and new entertainment and connectivity systems.

This modification increases the passenger seat count of the aircraft from 304 to 330 in accordance with Master Data List, 104337-MDL, Revision A, dated August 06, 2026, or later FAA approved revision, Serial Number Effectivity Report 104337-SNER, Revision New, dated January 23, 2023, or later FAA approved revisions.

This approval should not be incorporated in any aircraft of this specific model until compatibility of this modification with previously approved modifications has been determined by the installer. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

(Limitations and Conditions continued on page 3 of 5)

Date of Application: February 24, 2023 Date Reissued:

Date of Issuance: August 6, 2026 Date Amended:

Signature Cheryl Hurst

Title: ODA-700094-SW STC Administrator

The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is the propert y of the STC holder.

Number: ST11270DS Effective Date: August 6, 2026

Transfer the ownership of Supplemental Type Certificate Number: ST11270DS

The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is the propert y of the STC holder.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: ST11270DS Effective Date: August 6, 2026

This STC is contingent on prior or concurrent incorporation of the following service bulletins and STC:

1. Boeing Service Bulletin-CABIN SYSTEMS- Broadband Communication – Replacement of Panasonic Connectivity System with Viasat Ka Connectivity Antenna System Provision , SB 777-44-0071, Rev 00 dated October 20, 2023 or later approved revision

2. Boeing Service Bulletin – COMMUNICATIONS – Passenger Service System – Cabin System Control Panel and Cabin Area Control Panel Replacement and Software Change, SB 777-23-0069, Rev 00 dated January 19, 2018 or later approved revision

3. Boeing Service Bulletin – FIRE PROTECTION – Lavatory/Crew Rest Module Smoke Dectection System – Lavatory/Overhead Cross-Aisle Stowage (OCAS) Kidde Smoke Detector Replacement, SB 777-26-0060, Rev 01, dated July 25, 2013 or later approved revision

4. Safran Cabin Germany Service Bulletin – 1064G-25-01- Equipment Furnishings – Galley Activation of Oven and Coffee Maker Galley F1/F3, M1, M2, M7, and A1-A3, Rev L, October 27, 2015 or later approved revision

5. Safran Cabin Germany Service Bulletin – 1064G-25-08- Equipment Furnishings – Galley – Trolley Exchange for Galley Unit M1, Rev 03, February 11, 2020 or later approved revision

6. Safran Cabin Germany Service Bulletin – 1064G-25-09- Equipment Furnishings – Galley – Trolley Exchange for Galley Unit M2, Rev 03, February 11, 2020 or later approved revision

7. Safran Cabin Germany Service Bulletin – 1064G-25-12- Equipment Furnishings – Galley Trolley Exchange for Galley Unit A4, Rev 03, November 13, 2019 or later approved revision

8. S afran Cabin Germany Service Bulletin – 1064G-25-13- Equipment Furnishings – Galley – Replacement of Coffee Maker with Espresso Maker – Galley M1, Rev 02, August 19, 2019 or later approved revision

9. Safran Cabin Germany Service Bulletin – 1064G-25-15 – Equipment/Furnishings – Galley – Installation of Provisions for New Drawers - Galley Unit M1, Rev 02, February 11, 2020 or later approved revision

10. Safran Cabin Germany Service Bulletin – 1064G-25-16 – Equipment/Furnishings – Galley – Installation of Provisions for New Drawers - Galley Unit M2, Rev 02, November 13, 2019 or later approved revision

11. Safran Cabin Germany Service Bulletin – 1064G-25-19 – Equipment/Furnishings – Galley – Installation of Provisions for New Drawers - Galley Unit A4, Rev 02, October 17, 2019 or later approved revision

12. Safran Cabin Inc STC, ST02386LA, for Bar Unit Waste Container and Cart Stowage Modifications, applicable to the MS-2 Closet For Aircraft Serial Numbers 31543, 41665, 41668, 33522, 31546, and 31547

13. Boeing Service Bulletin 777-26-0060 – FIRE PROTECTION – Lavatory/Crew Rest Module Smoke Detection System – Lavatory/Overhead Cross-Aisle Stowage (OCAS) Kidde Smoke Detector Replacement, (applicable to new lavatories: 1F-1L, 1F-2L, 5A-1L and 5A-1R), Rev 1 dated July 25, 2013 or later approved revision For Aircraft Serial Numbers 31553, 33127, 31554, 33523, 31549, 33524, 31480, 32439, and 33538

14. Boeing Service Bulletin - LIGHTS – Passenger Compartment Lights – Sidewall Lights Inspection and Change, SB 777-33-0069, Rev 00 dated October 15, 2024 or later approved revision For Aircraft Serial Numbers 31543, 41665, 41668, 33522, 31546, 31547, 33125, 31548, 41666, 31550, and 33541

15. Boeing Service Bulletin - LIGHTS – Passenger Compartment Illumination– Obsolete Hybrid Fluorescent- LED Lights Replacement, SB 777-33-0070, Rev 00 dated December 20, 2024 or later approved revision

(Limitations and Conditions continued on page 4 of 5)

FAA Form 8110-2 (10/24) P age 3 of 5

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: ST11270DS Effective Date: August 6, 2026

The Airplane Flight Manual Supplement, 104337-AFMS, Revision NEW, dated July 29, 2026, or later FAA approved revision shall be made available to the operator at the time of installation.

The Instructions for Continued Airworthiness, Document Number 104337-ICA, Revision D, dated July 31, 2026, or later FAA accepted revision shall be made available to the operator at the time of installation. The aircraft shall be maintained in accordance with the applicable Instructions for Continued Airworthiness.

A revised EWIS ICA is not required for this STC.

Certification Basis:

Based on 14 CFR 21.101 and 21.115, and the FAA policy for non-significant changes in FAA Order 8110.48, the certification basis for the Boeing Model 777-323ER aircraft for the change is as follows:

a. The Type Certification basis for Boeing Model 777-323ER aircraft is shown on TCDS T00001SE for parts not changed or not affected by the change.

b. The certification basis for parts changed or affected by the change since the reference date of application, February 24, 2023, is based upon Part 25, as amended by Amendment 25-148 and Part 26 as amended by Amendment 26-7. Based on 14 CFR 21.101 and 21.115, and the FAA policy for non-significant changes in FAA Order 8110.48, the certification basis for this modification was determined to be:

Regulations at the latest amendment 25-0 through 25-148:

25.301, 25.303, 25.305(a)(b), 25.365(e)(f)(g), 25.561, 25.562(a)(b)(c)(1)(2)(3)(4)(5)(6)(7)(8), 25.601, 25.603,

25.605, 25.607, 25.609, 25.619, 25.623, 25.625, 25.681, 25.685(a)(c), 25.785(a)(b)(c)(d)(e)(f)(1)(3)(h)(i)(j)(k),

25.789, 25.791, 25.793, 25.795(c)(1)(3)(d), 25.803(c), 25.811(a)(b)(c)(d)(g), 25.815, 25.817, 25.831(b)(c),

25.853(a)(c)(d)(e)(g)(h), 25.854, 25.856(a), 25.863(a)(b)(d), 25.899, 25.1307(c), 25.1317(b), 25.1351(a)(b),

25.1415(b)(1), 25.1423(c), 25.1438(b), 25.1441, 25.1443(c), 25.1501(a)(b), 25.1529, 25.1541, 25.1557(a)(c)(d),

25.1561(a)(b)(c)

Regulations at the amendment level in TCDS T00001SE:

25.21(a)(1), 25.29, 25.307(a)(d), 25.571(a)(b), 25.611, 25.613, 25.621, 25.683, 25.783(j), 25.787(a)(b),

25.812(e)(1)(2)(i)(l)(1)(2), 25.813(a)(b)(d)(e), 25.831(a), 25.851(a)(b), 25.869(a)(4), 25.981(a)(3)(d), 25.1301,

25.1309(a)(b)(c)(d)(e)(f)(g), 25.1316(b), 25.1353(a)(b)(c)(1)(2)(3)(4), 23.1357(a)(c)(g), 25.1411(a)(b)(d)(1)(e)(f),

25.1431(a)(c), 25.1439(a)(b)(1), 25.1447(a)(c)(1)(4), 25.1450(a)(b), 25.1583(c)(2), 25.1585(a)(4)

Exemptions from 14 CFR Part 25:

Grant of Exemption, Section 25.813(e) Amendment 25-88 – No door may be installed in any partition between passenger compartments.; Exemption 22742, August 5, 2024

Equivalent Safety Findings exist with respect to the following regulations:

14 CFR 25.813(e) – Doors between passenger compartments, documented in Transport Airplane Directorate ELOS Memo 104337-CPP-25.813-1, Equivalent Level of Safety (ELOS) Finding for Moveable Privacy Dividers between Adjacent Mini-suites on Model 777-300ER airplane, Project # 104337, dated February 18, 2026

(Certification Basis continued on page 5 of 5)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: ST11270DS Effective Date: August 6, 2026

Certification Basis (continued):

Special Conditions:

FAA Special Condition No. 25-187A-SC, “Special Conditions: Boeing Model 777 Series Airplanes; Seats With Inflatable Lapbelts”, effective date October 29, 2004 FAA Special Condition No. 25-230-SC, “Special Conditions: Boeing Model 777 Series Airplanes; Overhead Crew Rest Compartments”, effective date April 9, 2003; SC9, SC17 FAA Special Condition No. 25-367-SC, “Special Conditions: Boeing Model 777 Series Airplanes; Seats With Non- Traditional, Large, Non-Metallic Panels”, effective date February 7, 2008 FAA Special Condition No. 25-621B-SC, “Special Conditions: The Boeing Company (Boeing), Model 777 Series Airplanes; Dynamic Test Requirements for Single Occupant Oblique Seats, With or Without Airbag Devices or 3- Point Restraints”, effective date October 22, 2018 FAA Special Condition No. 25-687-SC, “Special Conditions: The Boeing Company, Model 777-300ER Series Airplanes; Non-Rechargeable Lithium Battery Installations”, effective date May 31, 2017; SC1, SC2, SC3, SC4, SC5, SC6

Issue Paper:

FAA Issue Paper S-1 for 2-BTP Hand Fire Extinguishers, dated January 20, 2021 FAA Issue Paper CS-1 for Non-Halon Lavatory Trash Receptacle Automatic Fire Extinguishers, dated June 18, 2025 FAA Issue Paper S-1 for Installed Non-Rechargeable Lithium Batteries Means of Compliance, dated May 19, 2019 Transport Airplane Position Paper, TAPP-25.1353-1, for non-rechargeable lithium batteries in AmSafe NexGen Electronic Module Assemblies

14 CFR Part 26 Regulations Based on 14 CFR §21.101(g), applicable provisions of 14 CFR part 26 are included in the certification basis. For any future 14 CFR part 26 amendments, the holder of this STC must demonstrate compliance with the applicable sections. As of the issuance of this STC, compliance has been found for the following regulations 14 CFR § 26.11(c) Amendment 26-7, and 14 CFR § 26.47(c) Amendment 26-7.

-------------------------------------------------------------- END -----------------------------------------------------------------

Possession of this Su pplemental Type Certificate (STC) document by persons other than the STC holder does not constitute rights to the design data nor to alter an aircraft, aircraft engine, or propeller.