Do you remember Persona's games? That's a little of what Lon Houtz Bourne Street is. A virtual world created to interface with the original Sky Regalia.
Ikki's will and Yayoi's wish destroyed the 'heart' of A-T. A closed heart, created for one purpose and by one person, one that trapped people as much as it freed them. But destroying a heart . . . it means losing everything that was connected to it, too. All the dreams of everyone who ever tried to fly in that narrow sky.
[The camera travels farther, until it rests in front of two great doors, the symbols covering it of some obvious significance, but unfamiliar.]