Its not a flow...its only an interview.
Plus you need to meet requirements that include a college degree and a certain amount of time at the company. This "preferential interview" is the new shiny jet syndrome. No more shiny jets....now "pref" interviews!

DICLAIMER: no hate on C5 guys, probably had everyone of them in the jumpseat at one point or another, best group of chaps to talk to. Only wish them the best but ask others to approach with caution.