"""Looking forward for reusability, we don't believe it really, really counts unless you can turn it around rapidly, or almost as rapidly, as you turn around an aircraft,"" SpaceX President Gwynne Shotwell said Wednesday at the 33rd Space Symposium. ""Our challenge right now is to refly a rocket within 24 hours. That's when we'll really feel like we've got reusability right."" Credit: Tom Kimmell"