Drone Armies to End Flight Crashes

Is it possible to use groups of drones stationed strategically along flight routes to ensure that, when needed, they can take to the air and ensure that an aircraft in trouble will have a soft-landing?

Large Scale Noise Canceler - A Product We Needed Yesterday

Can you set up a sound system that'll ensure you don't need to don earplugs or mini-speakers in your ears and still not have to hear the sound of your neighbour's air-conditioner?

Why not get our great minds working on this one?