kingston Jamaica

this airport does not have a ILS approch system in either fs9 or the real world but a lot of big jets land there using rw12. A good number of times the weather is not so favorable a lot of times overcast i am talking in the real world and fs9 i think did a good job simulating that. what nav aids do these pilots use to land when the weather is not so good. I know of a fact that these jets go there what ever the condition is rain, clouds or poor visibilities. I know the air jamaica pilots are the best LOL. but how is it done?