Don't think anyone can, with the BK and all.....you might be able to get a better idea once this magic deal with Delta is actually published (after court approves it) because there are too many unknowns at RAH.

When will all 145s be parked, how many 170s will fly for Delta, and how is the AA and United 170/175 CPA going to look after BK. All those play into way too many unknowns to give an accurate upgrade time. Sorry, someone can chime in with either a made up number or the current upgrade time but neither will be accurate for a new hire. (tho to save you time looking the current upgrade is 4.5yrs I've been told)