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Why is there no immediate charge and entry to the Orbiterra starship and Bumper Cars when I have a reservation?

Orbiterra starship and Bumper Car sessions are 20 minutes each (about 4 rounds). If the number of reservations for the upcoming session is not at full capacity, visitors queuing without reservation will be let in to fill the vacancies. At this point, visitors with reservations but who arrived late will be charged and arranged for the next available ride.