Price of Global Hawk Surveillance Rises The cost of a program to build high-profile unmanned surveillance aircraft, known as Global Hawks, has increased by nearly \$900 million since 2001, according to a Government Accountability Office report released Monday.&lt;br&gt;&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-Renae Merle&lt;/b&gt;&lt;/font&gt;