Health insurance for aviation companies in the UAE and other Gulf countries is pretty standard. Some do it better some do not. They cater for your most common/frequent light ailements or routine tests/checks and it isn't too bad considering one (and the family) is pretty healthy.
When this is not the case and you have to rely on specialists or dedicated doctors here on elsewhere (like home country), well the picture is completely different and most do not cover it. Many aviation companies elsewehere don't generally do much different. This is my experience so far.