I just called and upgraded my card to the Venture card. They will use the same number so my credit history stays in tact and they should not do any hard pulls. The account specialist had to check but confirmed that they would accept the airlines statement. She also said that 25,000 miles was the highest for anyone she had processed so far, she was so 'excited' to hear that I had 700,000 miles in my account. She also read through a list of conditions that stated that the program would be done when the billion miles was gone.