Unfortunately there never has been an Oscar Mayer Wiener Jet. This image is a fake.
One of the earliest online references to the image dates back to Jan 15, 2007, when it was posted to the forum of philskies.net
. The poster (whose profile identified him as a 2D and 3D animator) wrote, "I probably shouldn't post this pic, but it's in good fun. This was doing the email rounds internally when they were coming up with a livery for it."
This suggests the image may have been a joke created by the graphic designers whom Boeing commissioned to create the livery for the 747-400 Largo Cargo Freighter
. The plane's unusual shape evidently reminded the designers of a hot dog.
The actual livery of the plane, shown below, was unveiled in December 2006.
When Oscar Mayer (retired Chairman of the Oscar Mayer corporation) died in July 2009, the "Oscar Mayer Jet" image temporarily gained a new boost of popularity.