diff --git a/src/features/online-board/components/BoardDetailsHeader/visibility/flightStatusVisibility.test.ts b/src/features/online-board/components/BoardDetailsHeader/visibility/flightStatusVisibility.test.ts
new file mode 100644
index 00000000..6a18a334
--- /dev/null
+++ b/src/features/online-board/components/BoardDetailsHeader/visibility/flightStatusVisibility.test.ts
@@ -0,0 +1,73 @@
+import { describe, it, expect } from "vitest";
+import { canViewFlightStatus } from "./flightStatusVisibility.js";
+import { AIRLINES_WITH_STATUS } from "../airlines.js";
+import type { ISimpleFlight } from "../../../types.js";
+
+function makeFlight(carrier: string, depUtc: string): ISimpleFlight {
+  return {
+    id: "X-1",
+    routeType: "Direct",
+    flyingTime: "1h",
+    status: "Scheduled",
+    flightId: { carrier, flightNumber: "0022", suffix: "", date: "20260417" },
+    operatingBy: { carrier, flightNumber: "0022" },
+    leg: {
+      arrival: {
+        scheduled: { airport: "", airportCode: "", city: "", cityCode: "", countryCode: "" },
+        latest: { airport: "", airportCode: "", city: "", cityCode: "", countryCode: "" },
+        dispatch: "", gate: "", terminal: "",
+        times: { scheduledArrival: { dayChange: { value: 0, title: "" }, local: "", localTime: "", tzOffset: 0, utc: "" } },
+      },
+      dayChange: 0,
+      departure: {
+        scheduled: { airport: "", airportCode: "", city: "", cityCode: "", countryCode: "" },
+        latest: { airport: "", airportCode: "", city: "", cityCode: "", countryCode: "" },
+        dispatch: "", gate: "", terminal: "", checkingStatus: "Scheduled", parkingStand: "",
+        times: { scheduledDeparture: { dayChange: { value: 0, title: "" }, local: "", localTime: "", tzOffset: 0, utc: depUtc } },
+      },
+      equipment: {},
+      flags: { checkinAvailable: false, returnToAirport: false, routeChanged: false },
+      flyingTime: "1h",
+      index: 0,
+      operatingBy: {},
+      status: "Scheduled",
+      updated: "",
+    },
+  } as ISimpleFlight;
+}
+
+describe("canViewFlightStatus", () => {
+  it("returns false for carrier not in AIRLINES_WITH_STATUS", () => {
+    const now = new Date("2026-04-17T10:00:00Z");
+    expect(
+      canViewFlightStatus(makeFlight("AF", "2026-04-17T12:00:00Z"), now, 24, AIRLINES_WITH_STATUS),
+    ).toBe(false);
+  });
+
+  it("returns false when departure is not same day as now (UTC)", () => {
+    const now = new Date("2026-04-17T23:59:59Z");
+    expect(
+      canViewFlightStatus(makeFlight("SU", "2026-04-18T00:30:00Z"), now, 24, AIRLINES_WITH_STATUS),
+    ).toBe(false);
+  });
+
+  it("returns true when SU same-day and within availableFromHours before departure", () => {
+    const now = new Date("2026-04-17T08:00:00Z");
+    expect(
+      canViewFlightStatus(makeFlight("SU", "2026-04-17T10:00:00Z"), now, 24, AIRLINES_WITH_STATUS),
+    ).toBe(true);
+  });
+
+  it("returns false when now is before availableFrom window", () => {
+    const now = new Date("2026-04-17T00:00:00Z");
+    // Departure 23:00 same day, availableFromHours=1 → available only from 22:00
+    expect(
+      canViewFlightStatus(makeFlight("SU", "2026-04-17T23:00:00Z"), now, 1, AIRLINES_WITH_STATUS),
+    ).toBe(false);
+  });
+
+  it("returns false when departure UTC is empty", () => {
+    const now = new Date();
+    expect(canViewFlightStatus(makeFlight("SU", ""), now, 24, AIRLINES_WITH_STATUS)).toBe(false);
+  });
+});
diff --git a/src/features/online-board/components/BoardDetailsHeader/visibility/flightStatusVisibility.ts b/src/features/online-board/components/BoardDetailsHeader/visibility/flightStatusVisibility.ts
new file mode 100644
index 00000000..1195c068
--- /dev/null
+++ b/src/features/online-board/components/BoardDetailsHeader/visibility/flightStatusVisibility.ts
@@ -0,0 +1,32 @@
+import { parseISO, subHours, isAfter, isSameDay } from "date-fns";
+import type { ISimpleFlight } from "../../../types.js";
+
+/**
+ * Flight Status button is visible when:
+ * - the operating carrier is in airlinesWithStatus
+ * - departure is same-day as now
+ * - now is within `availableFromHours` before departure
+ */
+export function canViewFlightStatus(
+  flight: ISimpleFlight,
+  now: Date,
+  availableFromHours: number,
+  airlinesWithStatus: Set<string>,
+): boolean {
+  const carrier = flight.operatingBy.carrier;
+  if (!carrier || !airlinesWithStatus.has(carrier)) return false;
+
+  const leg = flight.routeType === "Direct" ? flight.leg : flight.legs[0];
+  if (!leg) return false;
+
+  const depUtc = leg.departure.times.scheduledDeparture.utc;
+  if (!depUtc) return false;
+
+  const departure = parseISO(depUtc);
+  if (isNaN(departure.getTime())) return false;
+
+  if (!isSameDay(now, departure)) return false;
+
+  const availableFrom = subHours(departure, availableFromHours);
+  return isAfter(now, availableFrom);
+}