I have seen this picture, and this feature on the port fuselage called my attention. Does anybody know the purpose of this?
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One of the features on this American Airlines Airbus A319 is the Gogo Inflight Internet.
The A319 will be the first aircraft type in American’s fleet to use Gogo’s ATG-4 Wi-Fi solution. ATG-4 uses more antennas and better data compression technology to provide more robust and reliable service (August 15, 2013).
There's another one on the other side. It's part of the air-to-ground (ATG) internet setup that utilizes Gogo's cellular towers in the US and Canada, as opposed to satellite internet.
Related external links:
Thanks to @mins for their help on the answer.
