forget Delta Connection Academy
The bad news:
The new Delta is quitely dismanteling Comair, wich operates as Delta Connection (amongst others)
DCA First Skimming: The current cost for a new trainee is $140000 and takes approx. year to get a Flight Instructor rating
DCA Second Skimming: Then you "build time" as flight instructor
NOBODY makes it to Delta from Comair these days and probably onto the next decade
Comair furloughed around 100 pilots in the last month
You wil not be hired by any airline in the US unless you are a citizen or hold a green card already at the time of application.