Congrats to the new hires.
This post is mostly for the ex-military guys and IMO touches on the difference you will find between mil and airline training.
1. Callouts - they go from the mundane (normal takeoff - 80 kts, hold, thrust normal, V1, rotate, positve rate) to the somewhat different (V1 cut - 80kts, hold, thrust normal, v1 rotate, positive rate, gear up, -at 400 feet, the HAT check heading select, autothrottle off call tower, at 1000 feet - more stuff etc.
--My point is at DAL you are NOW talking and flying in initial training -normally not the case in AF training. Learn the callout littany ice cold - have your instructor write them out in their entirety -as a traffic pattern. It will make your 1st delta school easier and subsequent schools easier -too.
2. Systems are almost completely self taught, there is an important document with which you must become intimately familiar call the "learning objectives document" or LOD. This combined with your volume 2 covers all required systems knowledge.
3. Performance - the Military basically takes a point in space after takeoff and works backward to the takeoff position to determine performance and obstacle clearance. The airline starts in takeoff position and works its way forward to the obstacle. They get you to the same place, but how they get you there are backwards from each other.
4. Flows - basically the way to make sure all switches are in the right positions and all systems are checked. DAL provides flow pattern charts that give you a good headstart on an orderly flow pattern...you can change it with better aircraft familiarity. The flow mentality is derived from the philosophy that it is a "check" list, not a "do" list. You reference the checklist after you have done all your preparations and catch what you missed.
The USAF can cram 2 months of taining into 4 months. DAL crams 2 months of training into 3 weeks. The first school is the tough one only because it is foreign. The instructors by and large are great.
Again, Congratulations and welcome. We all hope you will be senior widebody lineholders by this time next year.