They do not share anything as they are two completely separate resorts. Initially, there was some bus sharing during nonpeak times when only one section of AoA was open, but that is no longer the case as 3 of the 4 AoA themes are now open.
But also if u see an AoA bus and there's room and you need to get back to POP fast... It's not a long walk over the bridge to the other resort... and vice versa. You are always free to use any bus or any transportation to any resort on property.
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