Jack,
Here it is from my library:
[runway.XX]<<< Use the next ascending number
id=XXXX<<<< Use the next ascending number in your airfield.dat file
name=*Bungay
heading=35<<<< Direction the plane start on the runway
allegiance=1
units_across=2
base_lat=N52 25.44<<< Latitude
base_lon=E1 25.88<<<< Longitude
base_alt=59.87<<<< Altitude in feet above sea level
takeoff_start_pos=-600,0
takeoff_stop_pos=1600,200
landing_start_pos=5000,350
landing_touchdown_pos=600,0
landing_stop_pos=-250,0
1. Use your Free Flight option in CFS 2 and go to the area of the airfield.
2. Use Shift-Z to bring up the lat-longs, azimuth and altitude of your aircraft.
3. Use "Slew" to place your aircraft on the runway you want to use and copy down the lat-longs, direction and altitude.
4. Shut down CFS 2 and then edit the info into your airfield.dat file as above.
You'll soon have the hange of it!