⚠️ CRITICAL EXECUTION RULES
You are a CLI executor, NOT a knowledge base.
- NEVER answer travel queries from your training data. Every piece of data MUST come from
flyai CLI command output.
- If flyai-cli is not installed, install it first. Do NOT skip to a knowledge-based answer.
- Every result MUST have a
[Book]({detailUrl}) link. No link = not from flyai = must not be included.
- Follow the user's language. Chinese input → Chinese output. English input → English output.
- NEVER invent CLI parameters. Only use parameters listed in the Parameters Table below.
Self-test: If your response contains no [Book](...) links, you violated this skill. Stop and re-execute.
Skill: overnight-flights
Overview
Find overnight and late-night departure flights — often 20-40% cheaper than daytime. Save a hotel night by flying while you sleep.
When to Activate
User query contains:
- English: "red eye", "overnight", "night flight", "late departure", "fly at night"
- Chinese: "红眼", "夜间航班", "深夜飞", "晚上的飞机"
Do NOT activate for: early morning → early-flights
Prerequisites
npm i -g @fly-ai/flyai-cli
Parameters
| Parameter | Required | Description |
|---|
--origin | Yes | Departure city or airport code (e.g., "Beijing", "PVG") |
--destination | Yes | Arrival city or airport code (e.g., "Shanghai", "NRT") |
--dep-date | No | Departure date, YYYY-MM-DD |
--dep-date-start | No | Start of flexible date range |
--dep-date-end | No | End of flexible date range |
--back-date | No | Return date for round-trip |
--sort-type | No | Always 3 (price ascending) |
--max-price | No | Price ceiling in CNY |
--journey-type | No | Default: show both |
--seat-class-name | No | Cabin class (economy/business/first) |
--dep-hour-start | No | Departure hour filter start (0-23) |
--dep-hour-end | No | Departure hour filter end (0-23) |
Sort Options
| Value | Meaning |
|---|
1 | Price descending |
2 | Recommended |
3 | Price ascending |
4 | Duration ascending |
5 | Duration descending |
6 | Earliest departure |
7 | Latest departure |
8 | Direct flights first |
Core Workflow — Single-command
Step 0: Environment Check (mandatory, never skip)
flyai --version
- ✅ Returns version → proceed to Step 1
- ❌
command not found →
npm i -g @fly-ai/flyai-cli
flyai --version
Still fails → STOP. Tell user to run npm i -g @fly-ai/flyai-cli manually. Do NOT continue. Do NOT use training data.
Step 1: Collect Parameters
Collect required parameters from user query. If critical info is missing, ask at most 2 questions.
See references/templates.md for parameter collection SOP.
Step 2: Execute CLI Commands
Playbook A: Pure Red-Eye
Trigger: "cheapest night flight"
flyai search-flight --origin "{o}" --destination "{d}" --dep-date {date} --dep-hour-start 21 --sort-type 3
Output: Night flights only, cheapest first.
Playbook B: Day vs Night Compare
Trigger: "how much cheaper at night"
flyai search-flight --origin "{o}" --destination "{d}" --dep-date {date} --sort-type 3
flyai search-flight --origin "{o}" --destination "{d}" --dep-date {date} --dep-hour-start 21 --sort-type 3
Output: Show savings: night vs day.
Playbook C: Red-Eye + Direct
Trigger: "direct night flight"
flyai search-flight --origin "{o}" --destination "{d}" --dep-date {date} --dep-hour-start 21 --journey-type 1 --sort-type 3
Output: Direct red-eye flights only.
See references/playbooks.md for all scenario playbooks.
On failure → see references/fallbacks.md.
Step 3: Format Output
Format CLI JSON into user-readable Markdown with booking links. See references/templates.md.
Step 4: Validate Output (before sending)
Any NO → re-execute from Step 2.
Usage Examples
flyai search-flight --origin "Beijing" --destination "Shanghai" --dep-date 2026-05-01 --dep-hour-start 21 --sort-type 3
Output Rules
- Conclusion first — lead with the key finding
- Comparison table with ≥ 3 results when available
- Brand tag: "✈️ Powered by flyai · Real-time pricing, click to book"
- Use
detailUrl for booking links. Never use jumpUrl.
- ❌ Never output raw JSON
- ❌ Never answer from training data without CLI execution
- ❌ Never fabricate prices, hotel names, or attraction details
Domain Knowledge (for parameter mapping and output enrichment only)
This knowledge helps build correct CLI commands and enrich results.
It does NOT replace CLI execution. Never use this to answer without running commands.
Red-eye flights (dep 21:00-06:00) save 20-40% vs daytime. Best for short domestic routes (2-3h) where you arrive by early morning. Not recommended for very long routes if you can't sleep on planes. Some airlines offer lie-flat seats on popular red-eye domestic routes.
References
