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- 58 Why do airplanes have rounded windows?
- 49 Why do helicopters have such limited range?
- 42 How did SR-71 spy, flying at 80,000 ft and 3500 km/h?
- 38 Why couldn't the A380 secure any orders for two straight years?
- 29 Why don't Russian aircraft sell as much as their European/American counterparts?
- 28 Why do some fighter jets have two pilots while others have only one?
- 28 Why are the call signs of some airlines completely different than their name?
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