The A-10 Warhog is a 25,000-pound monster with a 57-foot wingspan and twoto get it up into the sky. This model, built by , isn't quite the same magnitude of craft, but it's still pretty impressive that they got it in the sky.
A first prototype, this A-10 model is built out of foam board with two counter-rotating props to stand in for each of the two turbofan engines. It's not the most high-tech model, but it is dirt cheap, at an estimated cost of 50 bucks for the air frame, and less than $200 for the whole thing.
Then there's obviously the question of the cannon, and while this A-10 model didn't have one for its maiden flight, the plan is to install an Airsoft cannon in future models. That will definitely add a lot of weight to subsequent builds, but considering the real A-10 is pretty much a plane built around a cannon, it'll be a fitting engineering challenge.
In the meantime, this accomplishment is nothing to sneeze at.