The 9 simply means that at least 9 seats are available for sale in that fare class - there may be more, its a one digit field. Some reservation systems will show only 4 as a maxuimum available - that is for sale in one record. Sell those 4 or 9 and there are likely 4 or 9 more available.
When you see Y2 K0 V0 its saying 2 full fare Y available, no discounted K or V available.
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Have passport, will travel...
LAX, LHR, CDG, et.al.