This is a real photograph of an FA-18, completely unblemished by Photoshop. What kind of atmospheric conditions would lead to such an apparition? National Geographic has the answer.
Photographer Kirk McMenamin, who submitted this image to National Geographic's "Your Shot" writes:
This is a shot of an FA-18 performing a high-speed pass that resulted in a vapor cone forming around the back half of the plane. When viewed head-on, it made the plane appear to be coming out of a porthole. The photo was taken during the 2009 Gold Cup Races on the Detroit River.
I think McMenamin meant "portal," not "porthole." Like in Stargate or Lost.
via Your Shot