ALV is average line value. Each month our ALV goes up or down for the average line depending on program demand or forecast. We have a minimum line of 68 hours however for a line holder. Reserves get the ALV minus 2 hours not less than 72 for a guarantee. Typically you can not pick up any more flying at whatever the ALV is +15hrs. There is also a TLV which in essence levels the entire year in that the average for the year for the monthly ALV must meet a certain threshold as well...so as to prevent the company from making too many months low. I dont know what the TLV number is. Hope this helps.