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+# P5 — Flight Cards + Timeline + Aircraft Icons + "Уточняется" Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use `superpowers:subagent-driven-development` (recommended) or `superpowers:executing-plans`.
+
+**Goal:** Bring §4.1.15 (Online-Board flight-card details), §4.1.16 (Schedule flight-card details), §4.1.17 (day-change algorithm), §4.1.22 (aircraft icon algorithm), §4.1.23 ("Уточняется" fallback) into compliance.
+
+**Architecture:** Flight-details pages + components already exist from phase-1 and were extensively iterated during P1–P4. P5 is primarily an audit pass against TZ Tables 42+ for per-structure-form content.
+
+**Tech Stack:** TypeScript, React 18, Vitest + RTL.
+
+**Parent spec:** `docs/superpowers/specs/2026-04-21-online-board-schedule-tz-redesign-design.md`.
+
+**Target rule count:** §4.1.15 ≥100, §4.1.16 ≥120, §4.1.17 ≥5, §4.1.22 ≥10, §4.1.23 ≥5.
+
+---
+
+## File Structure
+
+### Files to create
+- `src/features/online-board/timelineTime.ts` + test — §4.1.15.7 time-calculation algorithm for timeline.
+- `src/features/online-board/previousFlight.ts` + test — §4.1.15.9 previous-flight algorithm.
+- `src/shared/flightStatusDisplay.ts` + test — §4.1.15.8 status-on-timeline display rules.
+- `src/shared/aircraftIcon.ts` + test — §4.1.22 aircraft-icon mapping algorithm.
+- `src/shared/tbd.ts` + test — §4.1.23 `"Уточняется"` fallback helper.
+
+### Files to modify
+- `src/features/online-board/components/OnlineBoardDetailsPage.tsx`
+- `src/features/online-board/components/FlightSchedule/*` — direct-flight timeline
+- `src/features/online-board/components/FullRouteTimeline/*` — multi-segment
+- `src/features/online-board/components/TransferBar/*` — connecting flights + intermediate-landing
+- `src/features/online-board/components/BoardDetailsHeader/*`
+- `src/features/online-board/components/FlightsMiniList/*`
+- `src/features/online-board/components/DetailsBackButton/*`
+- `src/features/online-board/components/details-panels/*`
+- `src/features/schedule/components/ScheduleDetailsPage.tsx`
+- `src/features/schedule/components/ScheduleFlightBody.tsx` (reused for some details views)
+- `src/i18n/locales/*/common.json` — i18n updates
+- spec file
+
+---
+
+## Task 1: Populate §4.1.15/16/17/22/23 rules
+
+Use same pattern as P1/P2/P3/P4 Task 1.
+
+TZ line ranges:
+- §4.1.15: ~1927 to ~2308
+- §4.1.16: ~2309 to ~2886
+- §4.1.17: ~2887 to ~2907
+- §4.1.22: ~2985 to ~3040
+- §4.1.23: ~3041 to ~3049
+
+Append rule rows. Status=TBD, Plan=P5.
+
+Commit: `Populate rule rows for P5 subsections 4.1.15/16/17/22/23 in TZ audit spec`.
+
+---
+
+## Task 2: `"Уточняется"` fallback helper (§4.1.23)
+
+Tiny, isolated. Create `src/shared/tbd.ts`:
+
+```ts
+/**
+ * Fallback display per TZ §4.1.23: when a field is missing from the API
+ * response, show the localized "Уточняется" label instead of an empty
+ * or dash value.
+ */
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type TFunction = (key: string, opts?: any) => string;
+
+export function tbdOr<T>(value: T | null | undefined, t: TFunction): T | string {
+  if (value === null || value === undefined) return t("SHARED.TBD");
+  if (typeof value === "string" && value.trim() === "") return t("SHARED.TBD");
+  return value;
+}
+```
+
+Add `SHARED.TBD` i18n key: ru = `"Уточняется"`, en = `"Pending"`, others empty.
+
+Add test.
+
+Commit: `Add "Уточняется" fallback helper per TZ 4.1.23`.
+
+---
+
+## Task 3: Aircraft icon mapping (§4.1.22)
+
+Create `src/shared/aircraftIcon.ts` + test that maps an IATA/ICAO aircraft-type code to an icon asset.
+
+Per TZ:
+- Map from aircraft type code → icon asset path.
+- Fall back to generic icon when unknown.
+- Icon has `title` / tooltip with aircraft-type name.
+
+Enumerate the TZ mapping (TZ likely has a table). Check if existing code has a mapping to reuse.
+
+Commit: `Add aircraft-icon mapping algorithm per TZ 4.1.22`.
+
+---
+
+## Task 4: Day-change algorithm (§4.1.17)
+
+§4.1.17 is already partially implemented (commit `d942cb5` for IFlyWarning, earlier commits for dayChange badges). Audit existing `dayChange` logic:
+- `dayChange = (arrLocalDate − depLocalDate) in whole days`, using each airport's local TZ.
+- Applies consistently across results, details, mini-list.
+
+Create `src/features/online-board/dayChange.ts` (or use existing if present) + test with comprehensive cases (including negative dayChange, +2 days, etc.).
+
+Commit: `Verify day-change algorithm per TZ 4.1.17`.
+
+---
+
+## Task 5: Timeline time-calculation algorithm (§4.1.15.7)
+
+Per TZ §4.1.15.7: which time to show on the timeline at each block — scheduled vs estimated vs actual, with status-driven selection.
+
+Create `src/features/online-board/timelineTime.ts` + test covering all status branches.
+
+Wire into `FlightSchedule` / `FullRouteTimeline`.
+
+Commit per logical cluster.
+
+---
+
+## Task 6: Timeline status display (§4.1.15.8)
+
+Per TZ §4.1.15.8: enumerate status states and their visual display rules (colors, labels, icon states).
+
+Audit existing `FlightStatus.tsx` and `details-panels/`. Add missing states.
+
+Commit.
+
+---
+
+## Task 7: Previous-flight algorithm (§4.1.15.9)
+
+Per TZ §4.1.15.9: how the "was previously" chip is populated (look up prior leg of the same aircraft).
+
+Create `src/features/online-board/previousFlight.ts` + test + wire into details header.
+
+Commit.
+
+---
+
+## Task 8: Flight details — direct flight (§4.1.15.4)
+
+Audit `OnlineBoardDetailsPage` rendering for direct flights: carrier, aircraft, from-to, times, terminal, gate, live status ladder (registration/boarding/deboarding blocks), on-board meals (§4.1.15.10), on-board services (§4.1.15.11).
+
+Fix gaps.
+
+Commit per cluster.
+
+---
+
+## Task 9: Flight details — multi-segment (§4.1.15.5 + §4.1.16.5)
+
+Per-leg breakdown, FullRouteTimeline visualization.
+
+Fix gaps.
+
+Commit.
+
+---
+
+## Task 10: Flight details — connecting (§4.1.16.6)
+
+Multiple flight numbers, transfer-time display, walk-between-gates visuals, `TransferBar` audit.
+
+Fix gaps.
+
+Commit.
+
+---
+
+## Task 11: Intermediate landing + transfer (§4.1.15.6 + §4.1.16.7)
+
+Same flight number, stop at intermediate airport, landed/took-off substates. Distinct from transfer (different flight number).
+
+Fix gaps.
+
+Commit.
+
+---
+
+## Task 12: Execution-days algorithm (§4.1.16.8)
+
+Schedule-specific: weekday mask derived from schedule rules.
+
+Audit existing impl + test.
+
+Commit.
+
+---
+
+## Task 13: Structure of details page (§4.1.15.1 + §4.1.16.1)
+
+Verify page layout: header, mini-list, day tabs, main content, footer.
+
+Commit.
+
+---
+
+## Task 14: Mini-list (§4.1.15.2 + §4.1.16.2)
+
+Audit `FlightsMiniList` composition, click behavior, selected-item styling.
+
+Commit.
+
+---
+
+## Task 15: Day tabs in details (§4.1.15.3 + §4.1.16.3)
+
+Audit day-tab behavior on details page (filtered to this flight number).
+
+Commit.
+
+---
+
+## Task 16: Update spec + merge gate
+
+Mark P5 rules Done. Merge.
+
+---
+
+## Self-Review
+
+**1. Spec coverage.** All P5 subsections have a dedicated task.
+
+**2. Placeholder scan.** Task 1 populates rule IDs; audit tasks find gaps. Standard P4-style audit plan.
+
+**3. Type consistency.** `tbdOr<T>` / `aircraftIconFor(code)` / `previousFlightOf(flight)` named consistently.
+
+---
+
+## Execution Handoff
+
+P5 is large — scope per-task and commit frequently.