There's enough fake news here to make Breitbart blush. Atlas has been doing interviews for Southern for quite some time. You get offered 777 class just like 767 and 747 it just depends on which type is on deck at the school house and in need of seats. They're still more than happy to put you in whatever type you want as long as you are willing to wait.

If you need a job yesterday and the 777 is the next available class it might be good for someone same for waiting around a month or so for the 747 if you have that luxury. Just like every airline though every class that gets passed up (even southern) is more people underneath you on an eventual joint seniority list. In Southern's case it's a bit of a gamble for how long until the joint CBA is signed but hey that's aviation.