"Figure 9 Mean VOT vs. Number of Trips: Airline System",, (Number of trips),, ,OD 2,OD 3 Case 1,0,0 Case 2,0,0 Case 3,2,"34,182" Case 4,"1,034","37,037" Case 5,"15,213","37,037" Case 6,"15,368","37,037" Case 7,"15,368","37,037" "Note: For Cases 1 and 2, the values are zero.",, ,,