
A United Airlines Boeing 737 MAX (in the airline's current livery with 'EXPLORER' visible on the fuselage) flies above a smaller NASA research aircraft that is producing visible contrails. This image appears to document a sustainable aviation fuel (SAF) contrail research mission, in which NASA flew chase aircraft to analyze contrail formation from the United Airlines jet.Open full document
Notes
Photograph showing two aircraft in flight against a deep blue sky with contrails visible. The larger aircraft in the foreground is a United Airlines plane with distinctive blue and white livery, while a smaller aircraft is visible in the distance below.