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Sun Country runs Navitaire (same PSS as JSX) but exposes their public availability search endpoint that returns BETTER load data than AA: per-flight `capacity` AND `sold` (booked passenger count), so we can compute exact load factor. Implementation: - AirlineLoadService.fetchSunCountryLoad: POSTs to syprod-api.suncountry.com/api/nsk/v4/availability/search/simple. Parses results→trips→journeysAvailableByMarket, matches by flight number, pulls capacity + sold + equipmentType from legInfo. - Returns a single Economy CabinLoad with capacity/booked = sold. No standby program — SY is single-cabin Y. - Auth: Azure APIM subscription key + a long-lived dotREZ JWT (both static, captured from suncountry.com network traffic, neither is a user session token). - Anti-bot: Imperva WAF in front of syprod-api.suncountry.com is gated on User-Agent + Referer + Origin headers. applySunCountryBrowserHeaders mirrors the pattern we use for UA / AA. NO WebView needed. - Explicit ⚠️ log when 403 Incapsula response detected, pointing at the header helper. Test infrastructure: - knownDailyFlights now carries a dayOffset (today vs tomorrow) per carrier — different upstreams have different snapshot windows: AM is T-1d..T+0 (today); SY's Navitaire only returns future flights (tomorrow); others default to tomorrow as a safer choice. - Added test_SY_sunCountry with hubs MSP/LAS/MCO/DEN. Fallback is SY104 LAS-MSP tomorrow. Docs: - AIRLINE_INTEGRATION_GUIDE: SY status row + full section 5c covering endpoint, auth, headers, response shape, failure modes, and how to re-capture tokens when they rotate. Reverse-engineering notes: - SY app is Flutter (Dart AOT) — bridge smali is minimal. Strings extracted from libapp.so revealed isNonRevTrip/isStandby/ inventoryControl keywords + the syprod-api hostname. - Token endpoint is PUT (not POST). Returns {"data":null} — token is the existing Authorization JWT, not a session refresh. - Confirmed working from plain curl with browser headers (no Imperva TLS-fingerprint gate beyond UA/Referer/Origin). Test run 2026-05-26 (xcodebuild test): ✅ AA, AM, AS, B6, EK, KE, SY (capacity=186 sold=184 load=99%), UA ⏭️ XE 8 passing, 1 skipped, 0 failures, 11s total. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>