The only reason Heaven's grace had been brought out of retirement now was because of the sheer size of it. Despite being nearly a hundred years old, it was still the largest airship in Equestria by far, and its enchanted hull negated its own weight, meaning it easily housed the Wonderbolts, and three hundred of the Night Guards, as well as the equipment they needed for the mission. At least it did if you didn't mind sharing rooms. Even so, it certainly beat flying to Mareitania and back in one night.