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Match the loyalty program, airports, dates, cabin, passengers and filters. Partner programs can offer different inventory for the same flight. Account status, member pricing or a different point of sale can also change what the airline shows.
Flexible dates cover the selected window and your plan's limits. Check the actual dates searched and any program failures; a calendar cell outside that scope says nothing about inventory.
Empty is different from unknown
A confirmed empty result describes a fresh, successful observation in the requested scope. A failed, stale or partially answered search cannot prove no seats exist.
Check Programs and your search's individual program outcomes. Remove unintended filters, then report a discrepancy with the source time and search ID if the two results still disagree. Avoid repeatedly refreshing an unavailable source.