diff --git a/src/features/flights-map/seo.test.ts b/src/features/flights-map/seo.test.ts
index aac2e411..b7b5d211 100644
--- a/src/features/flights-map/seo.test.ts
+++ b/src/features/flights-map/seo.test.ts
@@ -104,3 +104,74 @@ describe("buildFlightsMapJsonLd", () => {
     expect(result.name).toContain("Flight Map");
   });
 });
+
+// ---------------------------------------------------------------------------
+// TZ §4.1.19 — OpenGraph completeness assertions (Flights Map)
+// ---------------------------------------------------------------------------
+
+describe("4.1.19-R: OpenGraph completeness (Flights Map)", () => {
+  const ORIGIN = "https://flights.aeroflot.ru";
+
+  it("4.1.19-R: Flights Map page has all required OG tags", () => {
+    const seo = buildFlightsMapSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("website");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+});
+
+// ---------------------------------------------------------------------------
+// TZ §4.1.20 — Robots, canonical, hreflang assertions (Flights Map)
+// ---------------------------------------------------------------------------
+
+describe("4.1.20-R: canonical + hreflang (Flights Map)", () => {
+  const ORIGIN = "https://flights.aeroflot.ru";
+
+  it("4.1.20-R: Flights Map canonical has no query params", () => {
+    const seo = buildFlightsMapSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.canonical).not.toContain("?");
+    expect(seo.canonical).toBe(`${ORIGIN}/ru/flights-map`);
+  });
+
+  it("4.1.20-R: hreflang has all 9 languages + x-default", () => {
+    const seo = buildFlightsMapSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.hreflang.length).toBeGreaterThanOrEqual(9);
+    expect(seo.hreflang.some((h) => h.lang === "x-default")).toBe(true);
+  });
+
+  it("4.1.20-R: hreflang covers all 9 supported languages", () => {
+    const seo = buildFlightsMapSeo(stubT, "ru", ORIGIN);
+    const langs = seo.hreflang.map((h) => h.lang);
+
+    expect(langs).toContain("ru");
+    expect(langs).toContain("en");
+    expect(langs).toContain("es");
+    expect(langs).toContain("fr");
+    expect(langs).toContain("it");
+    expect(langs).toContain("ja");
+    expect(langs).toContain("ko");
+    expect(langs).toContain("zh");
+    expect(langs).toContain("de");
+  });
+
+  it("4.1.20-R: hreflang hrefs are absolute URLs", () => {
+    const seo = buildFlightsMapSeo(stubT, "ru", ORIGIN);
+
+    for (const entry of seo.hreflang) {
+      expect(entry.href).toMatch(/^https:\/\//);
+    }
+  });
+
+  it("4.1.20-R: noindex is not set on the Flights Map page (indexable)", () => {
+    const seo = buildFlightsMapSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.noindex).toBeFalsy();
+  });
+});
diff --git a/src/features/online-board/seo.test.ts b/src/features/online-board/seo.test.ts
index 772cad65..d14c40a3 100644
--- a/src/features/online-board/seo.test.ts
+++ b/src/features/online-board/seo.test.ts
@@ -471,3 +471,152 @@ describe("buildFlightDetailsSeo", () => {
     expect(result.og.type).toBe("article");
   });
 });
+
+// ---------------------------------------------------------------------------
+// TZ §4.1.19 — OpenGraph completeness assertions (all required tags present)
+// ---------------------------------------------------------------------------
+
+describe("4.1.19-R: OpenGraph completeness", () => {
+  const ORIGIN = "https://flights.aeroflot.ru";
+
+  it("4.1.19-R: Online-Board start page has all required OG tags", () => {
+    const seo = buildOnlineBoardStartSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("website");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+
+  it("4.1.19-R: Online-Board flight search has all required OG tags", () => {
+    const params = { type: "flight" as const, carrier: "SU", flightNumber: "0100", date: "20250115" };
+    const seo = buildFlightSearchSeo(stubT, params, "ru", ORIGIN);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("website");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+
+  it("4.1.19-R: Online-Board departure search has all required OG tags", () => {
+    const params = { type: "departure" as const, station: "SVO", date: "20250115" };
+    const seo = buildDepartureSearchSeo(stubT, params, "ru", ORIGIN);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("website");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+
+  it("4.1.19-R: Online-Board arrival search has all required OG tags", () => {
+    const params = { type: "arrival" as const, station: "JFK", date: "20250115" };
+    const seo = buildArrivalSearchSeo(stubT, params, "ru", ORIGIN);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("website");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+
+  it("4.1.19-R: Online-Board route search has all required OG tags", () => {
+    const params = { type: "route" as const, departure: "SVO", arrival: "JFK", date: "20250115" };
+    const seo = buildRouteSearchSeo(stubT, params, "ru", ORIGIN);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("website");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+
+  it("4.1.19-R: Online-Board flight details has all required OG tags", () => {
+    const seo = buildFlightDetailsSeoFromId(
+      stubT,
+      { carrier: "SU", flightNumber: "0100", date: "20250115" },
+      "ru",
+      ORIGIN,
+    );
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("article");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+});
+
+// ---------------------------------------------------------------------------
+// TZ §4.1.20 — Robots, canonical, hreflang assertions
+// ---------------------------------------------------------------------------
+
+describe("4.1.20-R: canonical + hreflang", () => {
+  const ORIGIN = "https://flights.aeroflot.ru";
+
+  it("4.1.20-R: canonical URL is normalized (no query params)", () => {
+    const seo = buildOnlineBoardStartSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.canonical).not.toContain("?");
+    expect(seo.canonical).toBe(`${ORIGIN}/ru/onlineboard`);
+  });
+
+  it("4.1.20-R: hreflang has all 9 languages + x-default", () => {
+    const seo = buildOnlineBoardStartSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.hreflang.length).toBeGreaterThanOrEqual(9);
+    expect(seo.hreflang.some((h) => h.lang === "x-default")).toBe(true);
+  });
+
+  it("4.1.20-R: hreflang covers all 9 supported languages", () => {
+    const seo = buildOnlineBoardStartSeo(stubT, "ru", ORIGIN);
+    const langs = seo.hreflang.map((h) => h.lang);
+
+    expect(langs).toContain("ru");
+    expect(langs).toContain("en");
+    expect(langs).toContain("es");
+    expect(langs).toContain("fr");
+    expect(langs).toContain("it");
+    expect(langs).toContain("ja");
+    expect(langs).toContain("ko");
+    expect(langs).toContain("zh");
+    expect(langs).toContain("de");
+  });
+
+  it("4.1.20-R: hreflang hrefs are absolute URLs", () => {
+    const seo = buildOnlineBoardStartSeo(stubT, "ru", ORIGIN);
+
+    for (const entry of seo.hreflang) {
+      expect(entry.href).toMatch(/^https:\/\//);
+    }
+  });
+
+  it("4.1.20-R: flight search canonical has no query params", () => {
+    const params = { type: "flight" as const, carrier: "SU", flightNumber: "0100", date: "20250115" };
+    const seo = buildFlightSearchSeo(stubT, params, "ru", ORIGIN);
+
+    expect(seo.canonical).not.toContain("?");
+    expect(seo.canonical).toMatch(/^https:\/\//);
+  });
+
+  it("4.1.20-R: noindex is not set on standard indexable pages (defaults to index,follow)", () => {
+    const seo = buildOnlineBoardStartSeo(stubT, "ru", ORIGIN);
+
+    // Standard pages must be indexable — noindex prop must be absent/falsy
+    expect(seo.noindex).toBeFalsy();
+  });
+});
diff --git a/src/features/schedule/seo.test.ts b/src/features/schedule/seo.test.ts
index df4386db..bdeb7bc7 100644
--- a/src/features/schedule/seo.test.ts
+++ b/src/features/schedule/seo.test.ts
@@ -367,3 +367,103 @@ describe("buildScheduleDetailsSeo", () => {
     expect(result.og.type).toBe("article");
   });
 });
+
+// ---------------------------------------------------------------------------
+// TZ §4.1.19 — OpenGraph completeness assertions
+// ---------------------------------------------------------------------------
+
+describe("4.1.19-R: OpenGraph completeness (Schedule)", () => {
+  const ORIGIN = "https://flights.aeroflot.ru";
+
+  it("4.1.19-R: Schedule start page has all required OG tags", () => {
+    const seo = buildScheduleStartSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("website");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+
+  it("4.1.19-R: Schedule search page has all required OG tags", () => {
+    const params = {
+      type: "route" as const,
+      outbound: { departure: "MOW", arrival: "LED", dateFrom: "20250115", dateTo: "20250120" },
+    };
+    const seo = buildScheduleSearchSeo(stubT, params, "ru", ORIGIN);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("website");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+
+  it("4.1.19-R: Schedule details page has all required OG tags", () => {
+    const fIds: IScheduleFlightId[] = [{ carrier: "SU", flightNumber: "0012", date: "20220527" }];
+    const seo = buildScheduleDetailsSeo(stubT, [], "ru", ORIGIN, fIds);
+
+    expect(seo.og.title).toBeTruthy();
+    expect(seo.og.description).toBeTruthy();
+    expect(seo.og.url).toMatch(/^https:\/\//);
+    expect(seo.og.image).toMatch(/^https:\/\//);
+    expect(seo.og.type).toBe("article");
+    expect(seo.og.locale).toBe("ru");
+    expect(seo.og.siteName).toBe("Aeroflot");
+  });
+});
+
+// ---------------------------------------------------------------------------
+// TZ §4.1.20 — Robots, canonical, hreflang assertions (Schedule)
+// ---------------------------------------------------------------------------
+
+describe("4.1.20-R: canonical + hreflang (Schedule)", () => {
+  const ORIGIN = "https://flights.aeroflot.ru";
+
+  it("4.1.20-R: Schedule start canonical has no query params", () => {
+    const seo = buildScheduleStartSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.canonical).not.toContain("?");
+    expect(seo.canonical).toBe(`${ORIGIN}/ru/schedule`);
+  });
+
+  it("4.1.20-R: hreflang has all 9 languages + x-default", () => {
+    const seo = buildScheduleStartSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.hreflang.length).toBeGreaterThanOrEqual(9);
+    expect(seo.hreflang.some((h) => h.lang === "x-default")).toBe(true);
+  });
+
+  it("4.1.20-R: hreflang covers all 9 supported languages", () => {
+    const seo = buildScheduleStartSeo(stubT, "ru", ORIGIN);
+    const langs = seo.hreflang.map((h) => h.lang);
+
+    expect(langs).toContain("ru");
+    expect(langs).toContain("en");
+    expect(langs).toContain("es");
+    expect(langs).toContain("fr");
+    expect(langs).toContain("it");
+    expect(langs).toContain("ja");
+    expect(langs).toContain("ko");
+    expect(langs).toContain("zh");
+    expect(langs).toContain("de");
+  });
+
+  it("4.1.20-R: hreflang hrefs are absolute URLs", () => {
+    const seo = buildScheduleStartSeo(stubT, "ru", ORIGIN);
+
+    for (const entry of seo.hreflang) {
+      expect(entry.href).toMatch(/^https:\/\//);
+    }
+  });
+
+  it("4.1.20-R: noindex is not set on standard indexable Schedule pages", () => {
+    const seo = buildScheduleStartSeo(stubT, "ru", ORIGIN);
+
+    expect(seo.noindex).toBeFalsy();
+  });
+});