The company painted a 747 freighter with the team logo and the Number 12 on the tail to salute the fans.
** Follow the flight's progress here
The plane rolled out of a hangar Wednesday at Paine Field in Everett. It flew to Boeing Field in Seattle on Thursday for a brief stop and then took off to fly a 12 pattern over Eastern Washington.
The freighter is owned by Boeing and used for flight testing.
Boeing partners with the Seahawks on program in the Puget Sound area and is displaying the 747 as a tribute to the team's success as it heads into the Super Bowl.