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A Learjet 24 and an Air Force T-37 meet in the skies over NASA Dryden for a series of flights to study the hazards of wake vortex generated by large aircraft. Studies conducted from the late 1960s to 1974 used large aircraft as wake generators and smaller instrumented aircraft such as the Learjet and T-37 were flown into the vortices to determine vortex strength and safe separation distances. The 747 is the same one acquired by NASA and later modified to carry space shuttles.

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The fleet number on the nose landing gear doors, "670," identifies this aircraft as an American Airlines Boeing 747-123, registered as N9670. It would later enter service with Pan American World Airways (Pan Am) as Clipper Empress of the Skies. She'd later be converted into a freighter configuration (747-100(SF)) for operation bu United Parcel Service (UPS), and later, Polar Air Cargo, re-registered as N858FT.

Dear San Diego Air & Space Museum Archives! First of all, thank you for making this awesome photo! As a creator of SpotterLead I would like to let you know that our automated algorithm has chosen this photo to be displayed on one of our flight search pages: spotterlead.net/flights/AA6198/2018-04-07. This photo might also appear on other pages which are alike this one. Thank you for publishing your photo under Non-Restrictive license and by this contributing your creativity to build a more equitable, accessible, and innovative world. Don't worry: all the credits to your photo as well as link to original are published on the page(s) in accordance with the license. You might also get more notifications like this, if more of your photos will be selected by our algorithm. If, for some reason, you don't feel comfortable with your photo being displayed on this site, please feel free to contact me. Have a good day!

Dear San Diego Air & Space Museum Archives! First of all, thank you for making this awesome photo! As a creator of SpotterLead I would like to let you know that our automated algorithm has chosen this photo to be displayed on one of our flight search pages: spotterlead.net/flights/AA6181/2018-05-07. This photo might also appear on other pages which are alike this one. Thank you for publishing your photo under Non-Restrictive license and by this contributing your creativity to build a more equitable, accessible, and innovative world. Don't worry: all the credits to your photo as well as link to original are published on the page(s) in accordance with the license. You might also get more notifications like this, if more of your photos will be selected by our algorithm. If, for some reason, you don't feel comfortable with your photo being displayed on this site, please feel free to contact me. Have a good day!