I'm wondering how often this happens en route over the US mainland with a final destination in Hawaii. I've flown these non-stop routes for nearly 30 years now (ORD-HNL, or ORD-OGG, or JFK-HNL) and had a fuel stop only once when leaving Chicago and flying to one of the islands. We wound up refueling in Seattle while other scheduled non-stop flights that day refueled in other west coast cities. I would think this rarely occurs but perhaps I'm wrong???