747 with an air scoop???

My father drove across northern Nevada yesterday. At one point, a 747 in
USAF markings flew low across the highway coming in for a landing at an
airport (he does not remember exactly where). The 747 had a truncated
cockpit hump... and a large air scoop just behind that. Does this sound
familiar to anyone?


I'd like to think it was an in-flight LOX production plane, but it's
probably something more mundane. Anyone?


--
Scott Lowther, Engineer
Remove the obvious (capitalized) anti-spam
gibberish from the reply-to e-mail address