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44b1f28bc4
The whole-string fuzzy fallback in callsignMatches() ran before the
digit-anchored check and let single-digit typos slip through (e.g.
"Lufthansa 350" matched expected "DLH359" at Levenshtein distance 1).
Spoken-digit-word candidates ("three five niner") bypassed the digit
anchor entirely since they contain no digit characters pre-fold.
Fold candidates through denormalizeSpokenAtc before checking for
digits, then require the flight number verbatim (word-boundary regex,
zero tolerance) while keeping the existing ~25% fuzzy tolerance on the
airline-name portion. Single-digit flight numbers (DLH4) now get the
same anchoring as longer ones.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>