The photographer, who asked to remain anonymous, said he took the picture Friday morning near Rose Hill, Kan., and the photo appeared Monday on the Canadian Web site UFO Digest, the Wichita (Kan.) Eagle reported Tuesday.
"The object came out of the clouds really fast. It sounded kind of like a jet but much, much softer and had a whirling sound with it," the man said. "I only got off one shot because it was really close before I realized it was something different. It went back upward, much like a jet, and was gone."
Dirk Vander Ploeg, editor and publisher of UFO Digest, said the object seems to resemble a prototype for a new form of fighter jet. However, he said he has "never seen a plane that looks like that."
Jarrod Bartlett, spokesman for Boeing Integrated Defense Systems-Wichita, said flight operations staff "were not able to identify the aircraft. We do not often get calls regarding unidentified aircraft."