Google, meanwhile, has developed balloons to beam down LTE cellular signals. They're meant to fly in Facebook's desired zone, between 60,000 and 90,000 feet. The company so far has launched at least hundreds of test balloons, and it's close to launching thousands.
During the talk, Facebook engineers said they still need to sort out the regulatory issues involved in flying Aquila.
For Facebook, Google's existing presence in the stratosphere looms large. To launch, Aquila will require a helium balloon, which will get it above commercial airspace quicker, Facebook engineers said.
They didn't say whether Aquila would rise above Google's balloons.
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