I don't think there is any such thing as luck. Your son was fortunate that you, his parents, loved and cared enough for him in that a very big sacrifice was made by you and to some part himself, to fund his dream. He's still got a long way to go and regardless of what people will tell you, airline pilot jobs are still very difficult to get for ab intio's. Direct entry is another matter but still not that easy. I wish you and your son all the very best in his endeavours
and not to give up on his dream. It will happen one day, he's still pretty young.