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VATSIM is the only ATIS source today, so an airport with no controller online
(EDDF, on the day this was reported) falls back to a raw METAR — which carries
neither an information letter nor a runway in use.
Add shared/utils/atisReport.ts, which turns whatever the live sources returned
into one AtisReport:
vatsim station broadcasting text; letter from atis_code or parsed from the
text; runway parsed from the text
metar no station: letter derived from the observation time, runway from the
headwind component over the published runway ends
fallback no METAR either: letter from the clock, airport's main runway
Deriving the letter from the observation keeps it stable across background
refetches while still advancing once per METAR cycle. Runway selection compares
METAR true wind against OpenAIP trueHeading (no magnetic correction needed) and
honours takeOffOnly/landingOnly ends.
The synthesised broadcast leaves the METAR groups coded, because
normalizeAtisForSpeech() already expands them for TTS.
Also fixes runway extraction for "RUNWAY IN USE 22" — the phrasing German
VATSIM ATIS actually uses, which the previous pattern missed entirely.
Tests run offline against VATSIM/METAR/OpenAIP responses recorded 2026-07-26,
including the EDDC case where the wind-derived runway matches what the live
controller published.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>