I always thought that creating artificial wormholes would be more possible. creating a device like a gate arch sort of like when characters exit the hollow deck in star trek except that with in the archway a wormhole is created and it's calibrated to another gate elsewhere connecting the 2 points and all you have to do is walk through it to get to the other location,  airlines as we know them would be obsolete instead you go to a wormhole port walk through security and reach your destination instantly no delays no layovers,  you'd have a separate one for luggage and would pick it up on the other side in the same manner as you do now when you travel to an international destination.