You would need to reset all the coordinates to go with a new map. They would need to correspond to a starting/ending airfield.
I did however try to change some coordinates in the plane set line.
196608,10,2,14,14,0.000000,0.000000,0.000000,-83370.343819,0.000000,-30572.162808,0,0.000000
I increased their values by +100 and the corresponding planes started to the left of the original start point, on an angle, then after starting their engines they taxied to the runway (I presume there is a waypoint there) and continued on their original flight path.