There really aren't tickets... you pay and walk in...if its for a gift, call them... see what they can do for you.
I really dont know. We didn't get to explore it when we went because it was raining. Make sure it is good weather
I didn't see anything referencing online tickets. Other than for larger groups, I don't know if it would be necessary. This might be different on open cockpit day or to tour the VC9.
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