No jobs are meaningless, whether you’re writing software, pumping gas, or flipping hamburgers. Yes, we’d all like to have gone to the moon, cure cancer, or whatever. It’s not how the world works. The question is, does the money or the work make you happier. If you want to work in aerospace, give up the money. Otherwise, realize you it sounds like you have a nice situation. If you want to keep the money, pursue other avenues for self fulfillment.