- Use resolved-flights-only denominator (landed+active+cancelled+diverted)
instead of all flights including scheduled/unknown. DXB was showing 15%
cancelled (NORMAL) when the real rate among resolved flights is ~58% (MAJOR).
- Add flight_date=today filter to AviationStack API calls to avoid mixing
historical/future flights into today's cancellation stats.
- Factor cancellation rate into ops summary table severity (was ignored,
only delay minutes were considered). Uses shared severityFromCancelRate()
to avoid threshold duplication.
- Add minimum resolved threshold (>=10) before using resolved denominator
to prevent extreme percentages from tiny samples.
- Add 12 major airports to AviationStack monitoring: YVR, SCL, DUB, LIS,
ATH, WAW, CAN, TPE, MNL, AMM, KWI, CMN (40→52 airports).
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