Yep, this is where the micro-manager has fun! You can set up a really easy C check system if you do them manually but, like ucfknightryan said, you have to be on top of it. This is also where fleet commonality really matters. Lease a cheap model identical to what you are flying then begin a C check extravaganza - manually start your C check cycle using your new leased a/c to cover existing routes - then when one a/c is done, immediately use it to cover another a/c's routes and then put that a/c into C check, and so on. It's expensive to do but you get all your C checks done one after the other and then you are good to go for several months. This system also rotates your a/c so schedule and flight hours/landings get spread around and you never miss a beat on income.