ExpertFlyer is a service that collects proprietary airline data, including award inventory, from a number of airlines and for a subscription fee, will reveal that data to consumers. ExpertFlyer is a unique tool, as they have contracts for data-sharing with airlines, unlike a number of other services which scrape the data from publicly available sources. I find that ExpertFlyer is the most accurate tool to search for award inventory for participating airlines, as it does not show phantom availability which can be a serious problem (looking at you Air France!).
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