Traditionally all the southern states from California going east are big flight Training states.
California and Florida pretty much lead the packs as far as certified certificates issued every year according to the FAA.
You don’t need ATP to do it quickly.
Any mom and pop operator with at least one full time isntructor can get you a CPL ME in 6 months or under.
However, they don’t have the connections that ATP does.
ATP will have you do coast to coast cross countries in a ME, you can work there after gaining your CFI and they have all sorts of deals with Regionals where you sign letters of intent while you’re still in training.
Doesn’t meant they’re the best there is but maybe a better option.
But only you can decide that based on which direction you want to go.
I do keep reading about them pushing checkrides and a string of failed checkrides is the last thing you need.