Research on Path Optimization of Vehicle-Drone Joint Distribution considering Customer Priority

Table 2

Parameters.

Symbol	Definition
	A vehicle fixed cost
	A drone fixed cost
	Vehicle unit travel cost
	Drone unit flight cost
	Vehicle load limit
	Drone load limit
	The farthest distance a drone can fly in a single trip
	Priority of point i
	Vehicle travel speed
	Drone flight speed
	Travelling distance of the vehicle from i to j
	Flight distance of the drone from i to j
	Customer i demand
	A large enough positive integer
	The path from i to j does not pass through the no-fly area
	The path from i to j does not pass through the restricted area