diff --git a/src/features/online-board/components/OnlineBoardDetailsPage.test.tsx b/src/features/online-board/components/OnlineBoardDetailsPage.test.tsx
index e7783ac9..cff3ff23 100644
--- a/src/features/online-board/components/OnlineBoardDetailsPage.test.tsx
+++ b/src/features/online-board/components/OnlineBoardDetailsPage.test.tsx
@@ -10,6 +10,7 @@ import { describe, it, expect, vi, beforeEach } from "vitest";
 import { render, screen } from "@testing-library/react";
 import { OnlineBoardDetailsPage } from "./OnlineBoardDetailsPage.js";
 import type { IParsedFlightId, IDirectFlight, IMultiLegFlight, IFlightLeg } from "../types.js";
+import type { SearchFlightsParams } from "../api.js";
 
 const mockFlightId: IParsedFlightId = {
   carrier: "SU",
@@ -111,22 +112,27 @@ vi.mock("@/i18n/provider.js", () => ({
   }),
 }));
 
+// Mutable so individual tests can inject ?request= params
+let mockSearchParamsInstance = new URLSearchParams();
+
 vi.mock("@modern-js/runtime/router", () => ({
   Link: ({ children, to, ...props }: { children: React.ReactNode; to: string; className?: string; [k: string]: unknown }) => (
     <a href={to} {...props}>{children}</a>
   ),
   useNavigate: () => vi.fn(),
   useParams: () => ({ lang: "ru-ru" }),
-  useSearchParams: () => [new URLSearchParams()],
+  useSearchParams: () => [mockSearchParamsInstance],
+}));
+
+const mockUseOnlineBoard = vi.fn((_params: SearchFlightsParams) => ({
+  flights: [],
+  loading: false,
+  error: null,
+  refresh: vi.fn(),
 }));
 
 vi.mock("@/features/online-board/hooks/useOnlineBoard.js", () => ({
-  useOnlineBoard: () => ({
-    flights: [],
-    loading: false,
-    error: null,
-    refresh: vi.fn(),
-  }),
+  useOnlineBoard: (params: SearchFlightsParams) => mockUseOnlineBoard(params),
 }));
 
 vi.mock("@/ui/layout/PageTabs.js", () => ({
@@ -146,6 +152,8 @@ describe("OnlineBoardDetailsPage", () => {
       loading: false,
       error: null,
     };
+    mockSearchParamsInstance = new URLSearchParams();
+    mockUseOnlineBoard.mockClear();
   });
 
   it("renders flight details", () => {
@@ -378,4 +386,48 @@ describe("OnlineBoardDetailsPage", () => {
       expect(screen.queryByTestId("flight-schedule")).toBeNull();
     });
   });
+
+  describe("parent-request codec (TZ §4.1.2 Table 5 row 6)", () => {
+    it("4.1.2-R-Request-route: hydrates mini-list from route parent-request", () => {
+      mockSearchParamsInstance = new URLSearchParams(
+        "request=onlineboard-route-MOW-LED-20260515",
+      );
+      render(
+        <OnlineBoardDetailsPage
+          flightId={mockFlightId}
+          locale="ru"
+          canonicalOrigin="https://example.com"
+        />,
+      );
+      // The first call to useOnlineBoard carries the parentParams derived from
+      // the route-kind request; assert it received departure + arrival + dates.
+      const calls = mockUseOnlineBoard.mock.calls;
+      const routeCall = calls.find(
+        ([p]) =>
+          p.departure === "MOW" &&
+          p.arrival === "LED" &&
+          p.dateFrom === "2026-05-15T00:00:00" &&
+          p.dateTo === "2026-05-15T23:59:59",
+      );
+      expect(routeCall).toBeTruthy();
+    });
+
+    it("4.1.2-R-Request-flight: flight-number parent-request does not dispatch secondary mini-list fetch", () => {
+      mockSearchParamsInstance = new URLSearchParams(
+        "request=onlineboard-flight-SU1234-20260515",
+      );
+      render(
+        <OnlineBoardDetailsPage
+          flightId={mockFlightId}
+          locale="ru"
+          canonicalOrigin="https://example.com"
+        />,
+      );
+      // flight kind → parentParams is null → useOnlineBoard falls back to
+      // the empty-params sentinel { dateFrom: "", dateTo: "" } and skips the fetch.
+      const calls = mockUseOnlineBoard.mock.calls;
+      const hasNonEmptyDateFrom = calls.some(([p]) => p.dateFrom !== "");
+      expect(hasNonEmptyDateFrom).toBe(false);
+    });
+  });
 });
diff --git a/src/features/online-board/components/OnlineBoardDetailsPage.tsx b/src/features/online-board/components/OnlineBoardDetailsPage.tsx
index b6e39d45..c6936693 100644
--- a/src/features/online-board/components/OnlineBoardDetailsPage.tsx
+++ b/src/features/online-board/components/OnlineBoardDetailsPage.tsx
@@ -19,6 +19,7 @@ import { useAppSettings } from "@/shared/hooks/useAppSettings.js";
 import { useFlightDetails } from "../hooks/useFlightDetails.js";
 import { useLiveFlightDetails } from "../hooks/useLiveFlightDetails.js";
 import { useOnlineBoard } from "../hooks/useOnlineBoard.js";
+import { parseDetailsRequestParam } from "@/shared/detailsRequestParam.js";
 import { buildFlightJsonLd } from "../json-ld.js";
 import { buildOnlineBoardUrl } from "../url.js";
 import { FlightDetailsAccordion } from "./details-panels/FlightDetailsAccordion.js";
@@ -405,34 +406,37 @@ export const OnlineBoardDetailsPage: FC<OnlineBoardDetailsPageProps> = ({
 
   // Angular's mini-list is populated from the PARENT search (e.g. all LED
   // departures for the day). The URL carries that context in the `request`
-  // query param — 'onlineboard-<type>-<iata>-<yyyymmdd>' — so we parse it
-  // and dispatch a second fetch via useOnlineBoard to feed the sidebar.
+  // query param — per TZ §4.1.2 Table 5 row 6 — so we parse it via the
+  // shared codec and dispatch a second fetch via useOnlineBoard to feed
+  // the sidebar.
   const parentRequest = useMemo(() => {
     const raw = searchParams.get("request");
-    if (!raw) return null;
-    const parts = raw.split("-");
-    if (parts.length < 4 || parts[0] !== "onlineboard") return null;
-    const [, kind, iata, yyyymmdd] = parts;
-    if (!iata || !yyyymmdd || yyyymmdd.length !== 8) return null;
-    const isoDate = `${yyyymmdd.slice(0, 4)}-${yyyymmdd.slice(4, 6)}-${yyyymmdd.slice(6, 8)}`;
-    if (kind === "departure") {
-      return { type: "departure" as const, departure: iata, date: isoDate };
-    }
-    if (kind === "arrival") {
-      return { type: "arrival" as const, arrival: iata, date: isoDate };
-    }
-    return null;
+    return raw ? parseDetailsRequestParam(raw) : null;
   }, [searchParams]);
 
   const parentParams = useMemo(() => {
     if (!parentRequest) return null;
-    return {
-      ...(parentRequest.type === "departure"
-        ? { departure: parentRequest.departure }
-        : { arrival: parentRequest.arrival }),
-      dateFrom: `${parentRequest.date}T00:00:00`,
-      dateTo: `${parentRequest.date}T23:59:59`,
-    };
+    const d = parentRequest.date;
+    const isoDate = `${d.slice(0, 4)}-${d.slice(4, 6)}-${d.slice(6, 8)}`;
+    const dateFrom = `${isoDate}T00:00:00`;
+    const dateTo = `${isoDate}T23:59:59`;
+    switch (parentRequest.kind) {
+      case "departure":
+        return { departure: parentRequest.station, dateFrom, dateTo };
+      case "arrival":
+        return { arrival: parentRequest.station, dateFrom, dateTo };
+      case "route":
+        return {
+          departure: parentRequest.departure,
+          arrival: parentRequest.arrival,
+          dateFrom,
+          dateTo,
+        };
+      case "flight":
+        // Flight-number parent: mini-list is already produced by the existing
+        // flight-details fetch (by-flight-number-and-date). No extra fetch.
+        return null;
+    }
   }, [parentRequest]);
 
   // When there's no parent request context, fall back to allFlights (this