Freelance photographer Matt Cawby has posted great photos of the first flight of N526BA, a 767-400ER once destined for service as a US Air Force testbed for the aborted E-10A program. Two more good shots on the ground here and here.
The USAF cancelled the contract for the N526BA in October 2007 after deciding not to make the third and final progress payment.
So Boeing now has a 767-400ER and -- so far, I think -- no customer. The USAF has paid about $90 million, or two-thirds of the total price tag, but has no airframe.
It is now the "lost 767-400ER".