The more important the position and role of the low altitude close-in air raid is in the modern local combat, the higher the requirement of air defense weapon system is.

随着低空近程空袭在现代局部战争的地位和作用越来越重要，对于反导防空武器系统的要求也越来越高。

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The altitude is also near the flight limit for some U.S. combat helicopters, officials said.

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To combat this threat, aircraft have a warning system which alerts the crew if the cabin altitude is approaching dangerous levels.

BBC: NEWS | Europe | Dangers of aircraft decompression