diff --git a/docs/superpowers/plans/2026-04-15-phase-3b-api-hooks.md b/docs/superpowers/plans/2026-04-15-phase-3b-api-hooks.md
new file mode 100644
index 00000000..29fa97ae
--- /dev/null
+++ b/docs/superpowers/plans/2026-04-15-phase-3b-api-hooks.md
@@ -0,0 +1,18 @@
+# Phase 3B -- Schedule API + Hooks
+
+> **Parent:** `2026-04-15-phase-3-schedule-master.md`
+> **Depends on:** 3A (types)
+
+## Deliverables
+
+1. `src/features/schedule/api.ts` -- three API functions
+2. `src/features/schedule/api.test.ts` -- unit tests
+3. `src/features/schedule/hooks/useScheduleSearch.ts`
+4. `src/features/schedule/hooks/useScheduleDetails.ts`
+5. `src/features/schedule/hooks/useScheduleCalendar.ts`
+
+## API Endpoints
+
+- `POST schedule/1` -- search (body: IScheduleSearchRequest)
+- `GET schedule/details` -- multi-flight details (query: flights[], dates[], departure, arrival)
+- `GET days/{date}/382/{param}/schedule/v1` -- calendar days
diff --git a/src/features/schedule/api.test.ts b/src/features/schedule/api.test.ts
new file mode 100644
index 00000000..625a9c8d
--- /dev/null
+++ b/src/features/schedule/api.test.ts
@@ -0,0 +1,256 @@
+import { describe, it, expect, vi } from "vitest";
+import { ApiClient } from "@/shared/api/client";
+import {
+  searchSchedule,
+  getScheduleDetails,
+  getScheduleCalendarDays,
+} from "./api";
+import type {
+  IScheduleSearchRequest,
+  IScheduleResponse,
+  IScheduleDetailsResponse,
+  IScheduleDaysResponse,
+} from "./types";
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+function createMockClient(responseBody: unknown, status = 200) {
+  const mockFetch = vi.fn<typeof fetch>().mockResolvedValue(
+    new Response(JSON.stringify(responseBody), {
+      status,
+      headers: { "Content-Type": "application/json" },
+    }),
+  );
+
+  const client = new ApiClient({
+    baseUrl: "https://api.test.com",
+    locale: "ru",
+    fetchImpl: mockFetch,
+    retry: { maxRetries: 0 },
+  });
+
+  return { client, mockFetch };
+}
+
+function extractUrl(mockFetch: ReturnType<typeof vi.fn>): URL {
+  const call = mockFetch.mock.calls[0] as [string, ...unknown[]];
+  return new URL(call[0]);
+}
+
+function extractBody(mockFetch: ReturnType<typeof vi.fn>): unknown {
+  const call = mockFetch.mock.calls[0] as [string, RequestInit];
+  return JSON.parse(call[1].body as string);
+}
+
+function extractMethod(mockFetch: ReturnType<typeof vi.fn>): string {
+  const call = mockFetch.mock.calls[0] as [string, RequestInit];
+  return call[1].method ?? "GET";
+}
+
+/** Minimal valid schedule response for testing */
+const SCHEDULE_RESPONSE: IScheduleResponse = [];
+
+const DETAILS_RESPONSE: IScheduleDetailsResponse = {
+  data: {
+    partners: ["SU"],
+    routes: [],
+    daysOfFlight: ["2025-01-15"],
+  },
+};
+
+const DAYS_RESPONSE: IScheduleDaysResponse = {
+  days: "2025-01-15,2025-01-16,2025-01-17",
+};
+
+// ---------------------------------------------------------------------------
+// searchSchedule
+// ---------------------------------------------------------------------------
+
+describe("searchSchedule", () => {
+  it("sends POST to schedule/1", async () => {
+    const { client, mockFetch } = createMockClient(SCHEDULE_RESPONSE);
+
+    const params: IScheduleSearchRequest = {
+      departure: "SVO",
+      arrival: "LED",
+      dateFrom: "2025-01-15",
+      dateTo: "2025-01-16",
+    };
+
+    await searchSchedule(client, params);
+
+    const url = extractUrl(mockFetch);
+    expect(url.pathname).toBe("/schedule/1");
+    expect(extractMethod(mockFetch)).toBe("POST");
+  });
+
+  it("sends params as JSON body", async () => {
+    const { client, mockFetch } = createMockClient(SCHEDULE_RESPONSE);
+
+    const params: IScheduleSearchRequest = {
+      departure: "SVO",
+      arrival: "LED",
+      dateFrom: "2025-01-15",
+      dateTo: "2025-01-16",
+      connections: 1,
+    };
+
+    await searchSchedule(client, params);
+
+    const body = extractBody(mockFetch);
+    expect(body).toEqual(params);
+  });
+
+  it("returns the deserialized response", async () => {
+    const { client } = createMockClient(SCHEDULE_RESPONSE);
+
+    const result = await searchSchedule(client, {
+      departure: "SVO",
+      arrival: "LED",
+      dateFrom: "2025-01-15",
+      dateTo: "2025-01-16",
+    });
+
+    expect(result).toEqual(SCHEDULE_RESPONSE);
+  });
+
+  it("throws on server error", async () => {
+    const { client } = createMockClient({ error: "internal" }, 500);
+
+    await expect(
+      searchSchedule(client, {
+        departure: "SVO",
+        arrival: "LED",
+        dateFrom: "2025-01-15",
+        dateTo: "2025-01-16",
+      }),
+    ).rejects.toThrow("HTTP 500");
+  });
+});
+
+// ---------------------------------------------------------------------------
+// getScheduleDetails
+// ---------------------------------------------------------------------------
+
+describe("getScheduleDetails", () => {
+  it("sends indexed flights and dates as query params", async () => {
+    const { client, mockFetch } = createMockClient(DETAILS_RESPONSE);
+
+    await getScheduleDetails(client, {
+      flights: ["SU0012", "SU0013"],
+      dates: ["2025-01-15", "2025-01-16"],
+      departure: "SVO",
+      arrival: "LED",
+    });
+
+    const url = extractUrl(mockFetch);
+    expect(url.pathname).toBe("/schedule/details");
+    expect(url.searchParams.get("flights[0]")).toBe("SU0012");
+    expect(url.searchParams.get("flights[1]")).toBe("SU0013");
+    expect(url.searchParams.get("dates[0]")).toBe("2025-01-15");
+    expect(url.searchParams.get("dates[1]")).toBe("2025-01-16");
+    expect(url.searchParams.get("departure")).toBe("SVO");
+    expect(url.searchParams.get("arrival")).toBe("LED");
+  });
+
+  it("returns the deserialized response", async () => {
+    const { client } = createMockClient(DETAILS_RESPONSE);
+
+    const result = await getScheduleDetails(client, {
+      flights: ["SU0012"],
+      dates: ["2025-01-15"],
+      departure: "SVO",
+      arrival: "LED",
+    });
+
+    expect(result).toEqual(DETAILS_RESPONSE);
+  });
+
+  it("throws on 404", async () => {
+    const { client } = createMockClient({ error: "not found" }, 404);
+
+    await expect(
+      getScheduleDetails(client, {
+        flights: ["SU999"],
+        dates: ["2025-01-15"],
+        departure: "SVO",
+        arrival: "LED",
+      }),
+    ).rejects.toThrow("HTTP 404");
+  });
+});
+
+// ---------------------------------------------------------------------------
+// getScheduleCalendarDays
+// ---------------------------------------------------------------------------
+
+describe("getScheduleCalendarDays", () => {
+  it("builds correct path for route without connections", async () => {
+    const { client, mockFetch } = createMockClient(DAYS_RESPONSE);
+
+    await getScheduleCalendarDays(client, {
+      date: "2025-01-15",
+      departure: "SVO",
+      arrival: "LED",
+      connections: false,
+    });
+
+    const url = extractUrl(mockFetch);
+    expect(url.pathname).toBe("/v1/days/2025-01-15/382/route/SVO-LED/schedule/");
+  });
+
+  it("builds correct path for route with connections", async () => {
+    const { client, mockFetch } = createMockClient(DAYS_RESPONSE);
+
+    await getScheduleCalendarDays(client, {
+      date: "2025-01-15",
+      departure: "SVO",
+      arrival: "LED",
+      connections: true,
+    });
+
+    const url = extractUrl(mockFetch);
+    expect(url.pathname).toBe("/v1/days/2025-01-15/382/connections/SVO-LED-1/schedule/");
+  });
+
+  it("parses comma-separated days string into array", async () => {
+    const { client } = createMockClient(DAYS_RESPONSE);
+
+    const result = await getScheduleCalendarDays(client, {
+      date: "2025-01-15",
+      departure: "SVO",
+      arrival: "LED",
+      connections: false,
+    });
+
+    expect(result).toEqual(["2025-01-15", "2025-01-16", "2025-01-17"]);
+  });
+
+  it("returns empty array for empty days string", async () => {
+    const { client } = createMockClient({ days: "" });
+
+    const result = await getScheduleCalendarDays(client, {
+      date: "2025-01-15",
+      departure: "SVO",
+      arrival: "LED",
+      connections: false,
+    });
+
+    expect(result).toEqual([]);
+  });
+
+  it("throws on server error", async () => {
+    const { client } = createMockClient({ error: "internal" }, 500);
+
+    await expect(
+      getScheduleCalendarDays(client, {
+        date: "2025-01-15",
+        departure: "SVO",
+        arrival: "LED",
+        connections: false,
+      }),
+    ).rejects.toThrow("HTTP 500");
+  });
+});
diff --git a/src/features/schedule/api.ts b/src/features/schedule/api.ts
new file mode 100644
index 00000000..113bf11c
--- /dev/null
+++ b/src/features/schedule/api.ts
@@ -0,0 +1,96 @@
+/**
+ * Schedule API functions.
+ *
+ * Pure functions -- each takes an `ApiClient` as a parameter (dependency
+ * injection). No React hooks, no context, no side effects.
+ *
+ * @module
+ */
+
+import type { ApiClient } from "@/shared/api/client.js";
+import type {
+  IScheduleSearchRequest,
+  IScheduleResponse,
+  IScheduleDetailsResponse,
+  IScheduleCalendarParams,
+  IScheduleDaysResponse,
+} from "./types.js";
+
+// ---------------------------------------------------------------------------
+// API functions
+// ---------------------------------------------------------------------------
+
+/**
+ * Search schedule flights.
+ * Maps to: `POST schedule/1` with body parameters.
+ *
+ * The API response is an array of flight objects (IFlight[]).
+ */
+export async function searchSchedule(
+  client: ApiClient,
+  params: IScheduleSearchRequest,
+): Promise<IScheduleResponse> {
+  return client.post<IScheduleResponse>("schedule/1", params);
+}
+
+/**
+ * Get multi-flight schedule details.
+ * Maps to: `GET schedule/details?flights[0]=...&dates[0]=...&departure=...&arrival=...`
+ *
+ * The Angular service uses indexed query params (flights[0], flights[1], etc.).
+ * We build the query object to match that format.
+ */
+export async function getScheduleDetails(
+  client: ApiClient,
+  params: {
+    flights: string[];
+    dates: string[];
+    departure: string;
+    arrival: string;
+  },
+): Promise<IScheduleDetailsResponse> {
+  const query: Record<string, string> = {
+    departure: params.departure,
+    arrival: params.arrival,
+  };
+
+  for (let i = 0; i < params.flights.length; i++) {
+    query[`flights[${i}]`] = params.flights[i]!;
+  }
+
+  for (let i = 0; i < params.dates.length; i++) {
+    query[`dates[${i}]`] = params.dates[i]!;
+  }
+
+  return client.get<IScheduleDetailsResponse>("schedule/details", query);
+}
+
+/**
+ * Get available calendar days for a given route.
+ * Maps to: `GET days/{date}/382/{param}/schedule/v1`
+ *
+ * The API returns `{ days: "2025-01-01,2025-01-02,..." }` -- a single
+ * comma-separated string. This function splits it into `string[]`.
+ */
+export async function getScheduleCalendarDays(
+  client: ApiClient,
+  params: IScheduleCalendarParams,
+): Promise<string[]> {
+  const routeSegment = params.connections
+    ? `connections/${params.departure}-${params.arrival}-1`
+    : `route/${params.departure}-${params.arrival}`;
+
+  const path = `v1/days/${params.date}/382/${routeSegment}/schedule/`;
+
+  const response = await client.get<IScheduleDaysResponse>(path);
+  return parseCalendarDays(response.days);
+}
+
+// ---------------------------------------------------------------------------
+// Internal helpers
+// ---------------------------------------------------------------------------
+
+function parseCalendarDays(days: string): string[] {
+  if (!days) return [];
+  return days.split(",").map((d) => d.trim()).filter(Boolean);
+}
diff --git a/src/features/schedule/hooks/useScheduleCalendar.ts b/src/features/schedule/hooks/useScheduleCalendar.ts
new file mode 100644
index 00000000..73f902db
--- /dev/null
+++ b/src/features/schedule/hooks/useScheduleCalendar.ts
@@ -0,0 +1,63 @@
+/**
+ * React hook for schedule calendar day availability.
+ *
+ * Calls `getScheduleCalendarDays` on param change, manages loading/days state.
+ *
+ * @module
+ */
+
+import { useState, useEffect, useRef } from "react";
+import { useApiClient } from "@/shared/api/provider.js";
+import { getScheduleCalendarDays } from "../api.js";
+import type { IScheduleCalendarParams } from "../types.js";
+
+export interface UseScheduleCalendarResult {
+  days: string[];
+  loading: boolean;
+}
+
+/**
+ * Hook for the calendar strip. Fetches available schedule days for the
+ * given route context.
+ */
+export function useScheduleCalendar(
+  params: IScheduleCalendarParams,
+): UseScheduleCalendarResult {
+  const client = useApiClient();
+  const [days, setDays] = useState<string[]>([]);
+  const [loading, setLoading] = useState(true);
+
+  const paramsRef = useRef(params);
+  paramsRef.current = params;
+
+  useEffect(() => {
+    let cancelled = false;
+    setLoading(true);
+
+    getScheduleCalendarDays(client, paramsRef.current)
+      .then((result) => {
+        if (!cancelled) {
+          setDays(result);
+          setLoading(false);
+        }
+      })
+      .catch(() => {
+        if (!cancelled) {
+          setDays([]);
+          setLoading(false);
+        }
+      });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [
+    client,
+    params.date,
+    params.departure,
+    params.arrival,
+    params.connections,
+  ]);
+
+  return { days, loading };
+}
diff --git a/src/features/schedule/hooks/useScheduleDetails.ts b/src/features/schedule/hooks/useScheduleDetails.ts
new file mode 100644
index 00000000..a20cf461
--- /dev/null
+++ b/src/features/schedule/hooks/useScheduleDetails.ts
@@ -0,0 +1,72 @@
+/**
+ * React hook for schedule flight details page.
+ *
+ * Calls `getScheduleDetails` on param change, manages loading/error/data state.
+ *
+ * @module
+ */
+
+import { useState, useEffect, useRef } from "react";
+import { useApiClient } from "@/shared/api/provider.js";
+import { getScheduleDetails } from "../api.js";
+import type { ISimpleFlight } from "../types.js";
+import type { ApiError } from "@/shared/api/errors.js";
+
+export interface UseScheduleDetailsParams {
+  flights: string[];
+  dates: string[];
+  departure: string;
+  arrival: string;
+}
+
+export interface UseScheduleDetailsResult {
+  flights: ISimpleFlight[];
+  loading: boolean;
+  error: ApiError | null;
+}
+
+/**
+ * Hook for schedule details page. Fetches multi-flight details
+ * based on flight IDs and dates.
+ */
+export function useScheduleDetails(
+  params: UseScheduleDetailsParams,
+): UseScheduleDetailsResult {
+  const client = useApiClient();
+  const [flights, setFlights] = useState<ISimpleFlight[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<ApiError | null>(null);
+
+  const paramsRef = useRef(params);
+  paramsRef.current = params;
+
+  // Serialize array params for dependency tracking
+  const flightsKey = params.flights.join(",");
+  const datesKey = params.dates.join(",");
+
+  useEffect(() => {
+    let cancelled = false;
+    setLoading(true);
+    setError(null);
+
+    getScheduleDetails(client, paramsRef.current)
+      .then((response) => {
+        if (!cancelled) {
+          setFlights(response.data.routes);
+          setLoading(false);
+        }
+      })
+      .catch((err: ApiError) => {
+        if (!cancelled) {
+          setError(err);
+          setLoading(false);
+        }
+      });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [client, flightsKey, datesKey, params.departure, params.arrival]);
+
+  return { flights, loading, error };
+}
diff --git a/src/features/schedule/hooks/useScheduleSearch.ts b/src/features/schedule/hooks/useScheduleSearch.ts
new file mode 100644
index 00000000..15cfab7e
--- /dev/null
+++ b/src/features/schedule/hooks/useScheduleSearch.ts
@@ -0,0 +1,78 @@
+/**
+ * React hook for schedule search pages.
+ *
+ * Calls `searchSchedule` on param change, manages loading/error/data state.
+ * No SignalR -- schedule data is static.
+ *
+ * @module
+ */
+
+import { useState, useEffect, useCallback, useRef } from "react";
+import { useApiClient } from "@/shared/api/provider.js";
+import { searchSchedule } from "../api.js";
+import type { IScheduleSearchRequest, IFlight } from "../types.js";
+import type { ApiError } from "@/shared/api/errors.js";
+
+export interface UseScheduleSearchResult {
+  flights: IFlight[];
+  loading: boolean;
+  error: ApiError | null;
+  refresh: () => void;
+}
+
+/**
+ * Hook for schedule search pages. Fetches flights based on search params
+ * and provides refresh capability.
+ */
+export function useScheduleSearch(
+  params: IScheduleSearchRequest,
+): UseScheduleSearchResult {
+  const client = useApiClient();
+  const [flights, setFlights] = useState<IFlight[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<ApiError | null>(null);
+  const [refreshKey, setRefreshKey] = useState(0);
+
+  const paramsRef = useRef(params);
+  paramsRef.current = params;
+
+  const refresh = useCallback(() => {
+    setRefreshKey((k) => k + 1);
+  }, []);
+
+  useEffect(() => {
+    let cancelled = false;
+    setLoading(true);
+    setError(null);
+
+    searchSchedule(client, paramsRef.current)
+      .then((response) => {
+        if (!cancelled) {
+          setFlights(response);
+          setLoading(false);
+        }
+      })
+      .catch((err: ApiError) => {
+        if (!cancelled) {
+          setError(err);
+          setLoading(false);
+        }
+      });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [
+    client,
+    params.departure,
+    params.arrival,
+    params.dateFrom,
+    params.dateTo,
+    params.timeFrom,
+    params.timeTo,
+    params.connections,
+    refreshKey,
+  ]);
+
+  return { flights, loading, error, refresh };
+}