Plus since your example includes an airport you could add the initial approach altitude. I used to get a clearance from Maui to Kona at night after the towers closed, "Cleared to Kona airport via flight planned route. Cruise FL 200, squawk xxxx. Clearance void if not off by xxxx, contact Honolulu this freq after departure." At that time, we owned all the airspace from the ground to FL 200 along that route.