Add Label 5Z AA/US Airways Variant 1 decoder plugin

[thepacket]

Adds a decoder for American Airlines / US Airways label 5Z 'OS' downlinks (Variant 1 — Airline Designated Downlink).

Wire format

OS KMSN /IR KMSN2209          ← in-range with ETA
OS KPHX /CLR                  ← clear
OS KDFW/ALT00001930           ← altimeter + ETA
OS KAUS/FTM\r\nLAST MINUTE REQ… ← free-text with crew request body

Coexists with existing Label_5Z_Slash (United Airlines variant) via leading-/ guard.

npm run build passes.

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Configuration used: Repository UI

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Run ID: 4f521e9e-07f3-4533-b215-f135d92736d0

📥 Commits

Reviewing files that changed from the base of the PR and between 10f9f69 and 89091c8.

📒 Files selected for processing (3)

• lib/MessageDecoder.ts
• lib/plugins/Label_5Z_AA.ts
• lib/plugins/official.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[kevinelliott]

Summary

Adds a Label_5Z_AA plugin for AA/US Airways "OS" downlinks (in-range, clear, ALT-altimeter, FTM free-text). Coexists with the existing United Label_5Z_Slash via an explicit text.startsWith('/') early-out. Registered in MessageDecoder.ts and official.ts.

Verdict

Changes requested — no tests, plus a couple of consistency / dispatch concerns.

Must Fix

• No tests. Please add coverage for the four documented shapes: OS KPHX /CLR, OS KSFO /IR KSFO0312, OS KDFW/ALT00001930, and an OS KAUS/FTM\r\nLAST MINUTE REQ… free-text. Include a negative test for /-prefixed messages so the United routing can't regress.
• subCommandDescriptions mis-labels several entries. OUT/OFF/ON/IN are listed under "subcommand", but those are themselves separate ARINC label-44 movement events; they are not known sub-codes for the AA OS variant in the body. Either document the actual AA observed list (IR/CLR/ALT/FTM) and drop the rest, or cite the source. As-is the table will mislead consumers.

Should Fix

• Coexistence with Label_5Z_Slash is fragile. Both plugins now register labels: ['5Z']. Label_5Z_Slash filters with preambles: ['/'], but Label_5Z_AA has no preamble qualifier — so for /-prefixed messages it still runs (and self-rejects via text.startsWith('/')). Cleaner: add a preamble qualifier to exclude /, or invert it (preambles: ['OS ']). This also lets the framework skip you faster on non-OS 5Z traffic.
• Duplicate / non-standard time keys. You set both raw.estimated_arrival_time (a HH:MM string) and raw.eta_time (via ResultFormatter.eta, seconds-since-midnight). Pick one; the seconds-of-day form is the convention used elsewhere.
• raw.altimeter_raw is unusual. If it’s genuinely raw/unparsed, prefer remaining.text or omit. The "may be padding" comment suggests this should not be exposed unless meaningful.
• HHMM range validation. convertHHMMSSToTod(time + '00') does no bounds check — 2599 would silently produce a wrong TOD. Validate hh < 24 && mm < 60 before calling, consistent with other plugins.
• raw.airline = 'American Airlines / US Airways' as a single combined string is a bit lossy — the format also describes "AA Variant 1" but stores both carrier names jointly. If known, use IATA/ICAO carrier code(s) per the message header, or split.

Nits

• freeText is built by joining bodyLines with \n after stripping \r — make sure the test for FTM checks both \r\n and \n separators don't break the match.
• m.groups destructuring with altIcao || timeA … is fine but a small jsdoc on the regex would help future maintainers (the alternatives are dense).
• "Out-Safe" is an unusual gloss for "OS" — Operational Status is by far the more common reading. Consider dropping the "Out-Safe" parenthetical.

Tests

Missing. See Must Fix.

Notes

• Registration LGTM (added to MessageDecoder pluginClasses and re-exported via official.ts).
• CodeRabbit hit a rate limit and did not actually review; the warning can be ignored.

Thanks @thepacket!