309 vs 409
How Atlas ancillary mapping errors 309 and 409 differ, and how to fix stale or mismatched baggage and seat productCode values.
Short answer
FAQ
What does 309 usually mean?
309 usually mean?What does 409 usually mean?
409 usually mean?Does a new sessionId or OfferId affect ancillary codes?
sessionId or OfferId affect ancillary codes?Core difference
309 — ancillary not found
309 — ancillary not found409 — baggage code does not match the segment
409 — baggage code does not match the segmentQuick decision rule
What to check first
Common mistakes
Reusing ancillaries after a new verify
Reusing baggage codes across different segments
Treating 409 like a generic stale-code error
409 like a generic stale-code errorBest practice
Related pages
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