diff --git a/src/features/online-board/components/BoardDetailsHeader/RegistrationButton.test.tsx b/src/features/online-board/components/BoardDetailsHeader/RegistrationButton.test.tsx
new file mode 100644
index 00000000..050f0a33
--- /dev/null
+++ b/src/features/online-board/components/BoardDetailsHeader/RegistrationButton.test.tsx
@@ -0,0 +1,52 @@
+// @vitest-environment jsdom
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen, fireEvent } from "@testing-library/react";
+import { RegistrationButton } from "./RegistrationButton.js";
+import type { ISimpleFlight } from "../../types.js";
+
+vi.mock("@/i18n/provider.js", () => ({
+  useTranslation: () => ({ t: (k: string) => k }),
+}));
+
+function makeFlight(carrier = "SU"): ISimpleFlight {
+  return {
+    id: "X",
+    routeType: "Direct",
+    flyingTime: "1h",
+    status: "Scheduled",
+    flightId: { carrier, flightNumber: "0022", suffix: "", date: "20260417" },
+    operatingBy: { carrier, flightNumber: "0022" },
+    leg: {} as never,
+  } as ISimpleFlight;
+}
+
+describe("RegistrationButton", () => {
+  beforeEach(() => {
+    Object.defineProperty(window, "open", { value: vi.fn(), writable: true });
+  });
+
+  it("renders label SHARED.ONLINE-REGISTRATION", () => {
+    render(<RegistrationButton flight={makeFlight()} />);
+    expect(screen.getByText("SHARED.ONLINE-REGISTRATION")).toBeTruthy();
+  });
+
+  it("has data-testid registration-button", () => {
+    render(<RegistrationButton flight={makeFlight()} />);
+    expect(screen.getByTestId("registration-button")).toBeTruthy();
+  });
+
+  it("click opens aeroflot.ru registration URL for SU", () => {
+    render(<RegistrationButton flight={makeFlight("SU")} />);
+    fireEvent.click(screen.getByTestId("registration-button"));
+    const openMock = window.open as ReturnType<typeof vi.fn>;
+    expect(openMock).toHaveBeenCalledTimes(1);
+    expect(openMock.mock.calls[0]![0]).toContain("aeroflot.ru");
+  });
+
+  it("click does not open anything for AF (no registrationUrl)", () => {
+    render(<RegistrationButton flight={makeFlight("AF")} />);
+    fireEvent.click(screen.getByTestId("registration-button"));
+    const openMock = window.open as ReturnType<typeof vi.fn>;
+    expect(openMock).not.toHaveBeenCalled();
+  });
+});
diff --git a/src/features/online-board/components/BoardDetailsHeader/RegistrationButton.tsx b/src/features/online-board/components/BoardDetailsHeader/RegistrationButton.tsx
new file mode 100644
index 00000000..5fcdb031
--- /dev/null
+++ b/src/features/online-board/components/BoardDetailsHeader/RegistrationButton.tsx
@@ -0,0 +1,32 @@
+import type { FC } from "react";
+import { useTranslation } from "@/i18n/provider.js";
+import type { ISimpleFlight } from "../../types.js";
+import { AIRLINES } from "./airlines.js";
+import "./actions.scss";
+
+export interface RegistrationButtonProps {
+  flight: ISimpleFlight;
+}
+
+export const RegistrationButton: FC<RegistrationButtonProps> = ({ flight }) => {
+  const { t } = useTranslation();
+
+  const handleClick = () => {
+    const carrier = flight.operatingBy.carrier;
+    if (!carrier) return;
+    const config = AIRLINES[carrier];
+    if (!config?.registrationUrl) return;
+    window.open(config.registrationUrl, "_blank", "noopener,noreferrer");
+  };
+
+  return (
+    <button
+      type="button"
+      className="flight-action-btn flight-action-btn--blue-light"
+      data-testid="registration-button"
+      onClick={handleClick}
+    >
+      {t("SHARED.ONLINE-REGISTRATION")}
+    </button>
+  );
+};