Allow pilots to create routes?

How can I set it up to where pilots can create their own routes? Like Canadian Xpress, you put in the departure and arrival and select the aircraft from their fleet you want to fly. You don’t have to book a flight and the airline doesn’t have to have it set as a particular flight… Can someone tell me how?

Sim Pilot has a charter module. http://www.simpilotgroup.com/module

You get charter flights on cavACARS http://cavacars.net63.net

or smartCARS

or this:

Both kACARS and amartCARS let a pilot create a charter. That is what you are describing. It is all done from the Acard App