Don't worry bout the MD-80 stuff if you don't have experience on it, CO retired that last year. If you don't have experience on the equipment, don't spout off about it at the interview.
Emphasize your strong points and abilities. Also state what you've learned from some of your weaker points.
At the interview, the HR and tech guys want to see if you will fit in. You already know that you're going to be working graves, holidays and weekends, right? They're going to ask if this is going to be a problem, if it is, then say so. If it is, then chances are then you may not be suited for this position.