Availability is a different concept from Lack. Lack is related to Need. 
Fighter is a type of Film. Fighter is related to Soldier. Soldier is related to March. March is a type of Month. 
Availability <--DistinctFrom--> Lack <--RelatedTo--> Need 
Film <--IsA-- Fighter <--RelatedTo--> Soldier <--RelatedTo--> March --IsA--> Month 