The output is fairly self-explanatory. It shows the Airline and flight number, then originating airport, departure time, arrival airport and arrival time, class of aircraft and number of stops. The availability listing shows the number of seats available in eac fare class, J = Business, etc. 9 is the maximum number shown, but more than 9 might be available in that class. The ordering is from most to least expensive, so you'll often see L sold out, but lots of B or Y available. For AC and most of us here, the most class is C, because that is the upgrade inventory.