They had several different planes out that you could look in--and some you could even get in!
This is N34, which is on the National Register of Historic Places. (I read that on the handout.) It is the FAA's last DC-3 and it was built in Oklahoma in 1945--again, from the handout. It was Jack's favorite thing there.
I'm not sure if it was actually part of the event (there was yellow caution tape all around the plane), but some guy let Jack sit in this plane.