This makes me extremely weary of flying, as you can deter birds on take off through sound deterrents on the ground, but not while in the sky. Birds may have even become conditioned to the sound of our noisy flight, thus not deterring them away from airplanes.

There is a entrepreneurial/engineer solution needed here! They rule out adding grilles due to fuel inefficiency, but what about rigging airplanes with the sound deterrents used on the ground - bird radar triggers these sounds? Just a thought...they'd probably have to be crazy insane loud.

I hope someone creates a solution soon! I dont want to land my next flight in the Hudson (chances are slim but still)!