2.  The biggest: Delta Air Lines, American Airlines, United Airlines and US Airways  There are over 300 airlines  Over 1 000 defunct airlines

3.  There are over 15 000 airports in the U.S.  The biggest airports are in Chicago, Dallas and Los Angeles  The biggest cargo airport is in Memphis

6.  The biggest aircraft manufacturer in the world  Products: commercial airlines, military aircraft, munitions and space systems  They compete with Airbus  Headquarters: Chicago, Illinois, U. S.  Founded: Seattle, Washington, U. S. (1916)

7.  B707, B717, B727, B737, B747, B757, B767, B777, B787 Dreamliner MD-10, MD-11  Military aircraft B377 Stratocruiser B-17 Flying Fortress B-29 Superfortress B-52H Stratofortress C-17 Globemaster III C-97 Stratofreighter F/A-18 Hornet

8. Boeing 737-600 First flight: 4. September 1967 Price: from $ 47 milion Maximum range: 5648 km Length: 33,63 m Height: 12,6 m Span: 43,05 m Cruising speed: 850 km/h Maximum height: 11 000 m Weight: 36,378 kg Passengers: 110

9. Boeing 747-400ER First flight: 9. February 1969 Price: $ 317,5 milion Maximum range: 14 200 km Lengh: 70,7 m Height: 19,4 m Span: 64,4 m Cruising speed: 920 km/h Maximum height: 12 800 m Weight: 184,600 kg Passengers: 366 - 524

11. Boeing 767-400ER First flight: 8. September 1982 Price: $ 154 – 169 milion Maximum range: 10 450 km Lengh: 61,4 m Heigh: 14,6 m Span: 51,9 m Cruising speed: 850 km/h Maximum heigh: 13 145 m Weight: 90,011 kg Passengers: 250 - 305 The Largest accident: 11. September 2001

12.  Headguarters: The Pentagon  Motto: "Aim High... Fly-Fight-Win' also '"Above All" and "No One Comes Close„  It is the most recent branch of the U.S. military to be formed, and is the most technologically sophisticated air force in the world.