Thanks for the answer.
Do I do that with this?
class SecondaryAirports {};
If so, it's already in.
BTW if it makes any difference, these are my ILS settings:
ilsPosition[] = {6188,2962};
ilsDirection[] = {1,0.08,0};
ilsTaxiOff[] = {6000,2891,6168,2919,6188,2942,6188,2958};
ilsTaxiIn[] = {5704,2960,5714,2926,5824,2924,5906,2896,6000,2891};