I've been taking the boys to the airport a lot this past week, and they've been having a lot of fun. We live in a large town (or small city, I'm not sure which) and it has a small regional airport. The university in town also has an extensive flight program.
On Saturday there was a small conference of Air Force men, and one had flown up in his private plane. He was happy enough to see two small boys so interested in aircraft that he let them sit in his plane. Over the past few days we've seen a number of small business jets, and today we saw a helicopter take off!
We've also seen a lot of fire trucks (not really good outside the station, but still exciting) and many motorcycles. It looks like it's going to be a good summer for little boy adventures!