No. The assumptions here insult my writer brain so much
Physics ABSOLUTELY is the ONLY fall back available, in a world without actual magic. Even super hero movies need to be internally consistent. You just aren't shaving 5 or 10 hours off by fiddling with the tech. It's a stupid, gaping plot hole that miraculously made it through edits. I'm guessing it fell through the cracks between the different directors.
Edit: No, it was more like shaving 20 or so hours off. They had, IIRC, 5 hours to get halfway around the world.