Delta, for the most part, will not care what type of training you received. More importantly, they focus on quality and how consistent your training is. Be prepared to explain large gaps in training and employment. If it took you 6 years to graduate with a 4 year degree, again, prepare to explain it. They want a good idea of your overall body of work and what motivates you. Did you make stupid mistakes growing up and even in college? Who hasn't? There aren't necessarily deal killers. If you wo(man) to your mistakes and believe you learned from them, there's a lot you can muck up and still get hired. Don't be convinced Delta is looking for perfection. They are simply looking for integrity and honesty above all.