I flew on the BA001 to New York last year from City Airport in London, and got Sequence Number 1 for check in and boarding card. I was very chuffed with myself... But, keeping in mind there were only 22 people on the plane with 10 empty seats, and I was sat at mu computer refreshing the Online Check In page at exactly 24H before, waiting for it to open, no wonder I got it!

I have my boarding card, SEQ-001 for the BA001 in my little scrap book...