All of our aircraft are touchable, though a few have minimal rope stanchion barriers to keep people from either accidently walking into a pitot tube or trying to climb up onto a wing. It's kind of a policy here at the Midway that guests have access to everything, barring items that aren't repairable or things for safety reasons. You should see the abuse that our five climb-in cockpit sections have to endure - they are continually being repaired/renovated by our airwing department.
Of all of our 30 aircraft, only the TBD will be out of reach to the public, as it will be hanging from the overhead in a back corner of hangar bay #1. It will still be low enough to touch parts (like the torpedo) but for the most part it will not be in an area that guests will access.
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It will be hung behind the Wildcat, to the left of the theater that is in the center of the above photo. This will unfortunately obscure it from easy viewing from a distance, but guests will be able to see it better once they get into the Battle of Midway exhibit, and especially as they prepare to enter the theater.
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Here's another bit of trivia on our BOM exhibit: our Wildcat is a rare genuine Grumman F4F-3 with non-folding wings. It was recovered out of the Great Lakes back in the 1990's, and is the only one of our WWII vintage aircraft that is on loan from the NMNA in Pensacola. (All of our others came from private owners.)