在飞行试验中，诺斯罗普·格鲁门公司的一架Proteus试验机和美国航天局的一架全球鹰飞行在13716米(4.5万英尺)的高空，距离接近12.2米(40英尺)，创造了行业纪录。

In a key risk reduction flight test, Northrop Grumman's Proteus test aircraft and a NASA Global Hawk flew as close as 40 feet apart at an altitude of 45,000 feet, an industry-setting record.

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