Well letīs do this orderly.
1.Airplane: This may break down to a monthly cost and/or hourly cost e.g. maintenace reserves, APU reserves etc. you need to find these out and if monthly, break them down to estimated flight hours.
2.Maintenance: If you have a per hour maintenace contract, this is easy, but usually it is not so. So you need to try to get as close as possible to estimate your hourly maintenace cost. Bear in mind that some maintenace costs will be incurred whether you fly or not.
3.Crew cost: Again, this may divide into fixed (monthly)cost and hourly cost (per-diems, sector pay etc) You need to find a way to estimate your hourly cost. This may be quite complicated.
4.Insurance: Usually farily easy to convert into a hourly figure.
5.Fuel: Average block hour fuel use. Goes up and up and...
6.Route cost: Handling fees, Landing fees, Route charges (ATC and overflight fees), Pax handling fees (sometimes incl in handling) etc.
If you do this properly, you will know your hourly cost.
Add a margin for unknowns if you are going to sell for block hour.
Once you have done all this, you will probably want to go into a different business.
