The Austin Airplane Flyover Mystery

http://www.infowars.com/low-flying-doomsday-plane-buzzes-austin,
https://en.wikipedia.org/wiki/Boeing_E-4, http://www.fas.org/programs/ssp/man/uswpns/air/special/e4b.html
Usually airplanes aren't allowed to fly that low over cities. Except when taking off or approaching an airport on an authorized flight-path. http://en.wikipedia.org/wiki/Flight_plan#Special_use_airspace

http://www.boeing.com/boeing/defense-space/military/e4b,
http://www.youtube.com/watch?v=M3HJL8vJOHA,
http://www.af.mil/information/factsheets/factsheet.asp?fsID=99

http://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Austin,
http://skyscraperpage.com/diagrams/?cityID=93

TX http://skyscraperpage.com/diagrams/?stateID=25
US http://skyscraperpage.com/diagrams/?countryID=2

Chicago isn't permitted to build any tower over 2000 feet.
http://skyscraperpage.com/diagrams/?cityID=4
NYC is 1776 feet.
http://skyscraperpage.com/diagrams/?cityID=8
LA is about 1020 feet.
http://skyscraperpage.com/diagrams/?cityID=26
Houston is about 1002 feet.
http://skyscraperpage.com/diagrams/?cityID=28