diff --git a/src/features/online-board/components/details-panels/AircraftPanel.test.tsx b/src/features/online-board/components/details-panels/AircraftPanel.test.tsx
index dbb3eef8..619b2f00 100644
--- a/src/features/online-board/components/details-panels/AircraftPanel.test.tsx
+++ b/src/features/online-board/components/details-panels/AircraftPanel.test.tsx
@@ -67,22 +67,12 @@ describe("AircraftPanel", () => {
     expect(screen.getByTestId("aircraft-panel")).toBeTruthy();
   });
 
-  // §4.1.15.4: tail number (registration mark) in aircraft panel
-  it("4.1.15.4-TailNumber: renders tail number when aircraft.registration is present", () => {
+  it("TIRREDESIGN-29: omits tail number when aircraft.registration is present", () => {
     const eq: IEquipmentFull = {
       aircraft: { actual: { title: "Airbus A320", registration: "VP-BQS" } },
     };
     render(<AircraftPanel equipment={eq} />);
-    expect(screen.getByText("VP-BQS")).toBeTruthy();
-    // label key is AIRPLANE.TAIL-NUMBER (t mock returns key)
-    expect(screen.getByText("AIRPLANE.TAIL-NUMBER")).toBeTruthy();
-  });
-
-  it("4.1.15.4-TailNumber-Absent: omits tail-number row when registration is not present", () => {
-    const eq: IEquipmentFull = {
-      aircraft: { actual: { title: "Airbus A320" } },
-    };
-    render(<AircraftPanel equipment={eq} />);
+    expect(screen.queryByText("VP-BQS")).toBeNull();
     expect(screen.queryByText("AIRPLANE.TAIL-NUMBER")).toBeNull();
   });
 
diff --git a/src/features/online-board/components/details-panels/AircraftPanel.tsx b/src/features/online-board/components/details-panels/AircraftPanel.tsx
index 32f8d880..0d9c25f5 100644
--- a/src/features/online-board/components/details-panels/AircraftPanel.tsx
+++ b/src/features/online-board/components/details-panels/AircraftPanel.tsx
@@ -112,11 +112,6 @@ export const AircraftPanel: FC<AircraftPanelProps> = ({
     className?: string;
   }> = [];
   if (aircraft?.name) props.push({ label: t("AIRPLANE.NAME"), value: aircraft.name });
-  // §4.1.15.4: tail number (registration mark, e.g. "VP-BQS") from the
-  // aircraft.actual.registration field. Shown when present.
-  if (aircraft?.registration) {
-    props.push({ label: t("AIRPLANE.TAIL-NUMBER"), value: aircraft.registration });
-  }
   if (total > 0) props.push({ label: t("AIRPLANE.SEATS-TOTAL"), value: total });
   if (economy > 0) props.push({ label: t("AIRPLANE.SEATS-ECONOMY"), value: economy });
   if (comfort > 0) props.push({ label: t("AIRPLANE.SEATS-COMFORT"), value: comfort });
diff --git a/tests/e2e/onlineboard-aircraft-link.spec.ts b/tests/e2e/onlineboard-aircraft-link.spec.ts
index b91d319c..4a75adf8 100644
--- a/tests/e2e/onlineboard-aircraft-link.spec.ts
+++ b/tests/e2e/onlineboard-aircraft-link.spec.ts
@@ -8,6 +8,9 @@ import { nextOnlineboardDetailsFixture } from "./helpers/onlineboard-fixtures";
 // title under "Борт" must be a clickable external link that opens in a new tab.
 // Angular renders:
 //   http://www.aeroflot.ru/cms/{language}/flight/plane_park
+//
+// TIRREDESIGN-29 — Angular does not show the aircraft tail/board number in
+// this online-board details card, even when the API payload contains it.
 
 const FIXTURE_DIR = path.resolve(
   path.dirname(fileURLToPath(import.meta.url)),
@@ -24,12 +27,19 @@ test("Onlineboard details aircraft title opens Aeroflot plane park in a new tab"
   consoleMessages,
 }) => {
   const details = nextOnlineboardDetailsFixture(onlineboardDetails);
+  const detailsPayload = JSON.parse(details.body);
+  detailsPayload.data.routes[0].leg.equipment.aircraft.actual = {
+    type: "SU9",
+    title: "Sukhoi SuperJet 100",
+    registration: "89104",
+    name: "Ессентуки",
+  };
 
   await page.route("**/api/flights/v1.1/ru/onlineboard/details?**", async (route) => {
     await route.fulfill({
       status: 200,
       contentType: "application/json",
-      body: details.body,
+      body: JSON.stringify(detailsPayload),
     });
   });
 
@@ -49,6 +59,8 @@ test("Onlineboard details aircraft title opens Aeroflot plane park in a new tab"
 
   const link = aircraftRow.locator("a.details-row__subtitle-link");
   await expect(link).toHaveText("Sukhoi SuperJet 100");
+  await expect(aircraftRow.getByText("Бортовой номер")).toHaveCount(0);
+  await expect(aircraftRow.getByText("89104")).toHaveCount(0);
   await expect(link).toHaveAttribute(
     "href",
     "http://www.aeroflot.ru/cms/ru/flight/plane_park",