Well, being an "Airbus lover" myself, I say it's terrific news. I have always been a great fan of the 737 and I think it's a well deserved succes.
To answer your question, Michael, I think (and it's a guess, since I don't have my Production List to hand), it's 1996.
However, I'm curious as to how long it will take Boeing to reach the 5,000th 737. I think the final number of 737 "Classics" (-100 to -500) was around 3,240. So, this 737 for ATA brings the total number built to 4,740. So, 260 to go, at a production rate of, say, 13 per month . . .
Should we expect the 5,000th to be rolled out in late 2005/early 2006.
That should be quite a party!