but arbitrarily limiting the list to 10 makes it pretty meaningless. The list is also too US centric. There have literally been thousands of airplane designs from around the world over the past 100 years, and many of them are just as significant as most of those on the list. Now, if you increased the list to a more realistic value, say 50 or 100, then the list could be more meaningful. It could've included the 1903 Wright Flyer, the Spitfire and Hurricane for their role in winning the Battle of Britain (a pivotal event in winning the war), the Lancaster, the Il-2, and a lot of other significant planes. I didn't see any helicopters there, either.

BTW: I don't know if it's really accurate to call the JN-4 Jenny the "first mass produced plane." It may qualify for that title here in the US but France, Britain and Germany were building a lot of planes at about the same time. Some of them, such as the Fokker Eindecker (1st real fighter) and the SPAD also belong on the list, IMO.