Cargo handling

Hello to everyone, I have constructed a little cargo center but I can't nderstand why I can't use it for handling the cargo of my airline. I can't stipulate a contract with myself and also without contract does not apply automatically to use for handling my cargo, what's the problem? thanks.

There are two steps to handling your own passenger and/or cargo handling. First is to allocate capacity, which is done on the Office/buildings&contracts page, then you need to assign routes to the contract in the route management screen. These steps must be performed in that order.