So let me get this straight: you could be hired into a 737 at Delta a year and five months ago, then upgrade to CA in a MD-88?
First off, that's very quick.
Second, if this came out in the press, do you think there will be some sort of backlash by the public in regards to safety? I do not think I would want to fly with a CA in that position, nor would I want to be a CA in that position. If my wife was a FA at Delta, I do not think I'd be comfortable with that either.
But, all that being said, I'm sure there's some sort of restriction on when you can upgrade.