Basically what the other guy said! “Flow” or their special needs cousin “preferred hiring” programs exists to staff the RJ flying by giving people the hopes of an easy transition to a major. Easiest way to get actually to a major is work for the competition or “fly” for them so hiring you takes away a resource from the competition (LCCs and ULCCs included). Put it this way, if you are flying an RJ for a major why would they want to bring you up as quick as possible when you are already flying their passengers for less cost (less pay)?

Do people flow? Yes, but often it takes at least 2-3 times as long as they told you it would when you started assuming there is actually a contractual obligation to flow you up. Sky weezy puts you in the unique position of flying for all 3 majors (+ Alaska) so getting hired outside of any of the programs is very difficult and the Sky->SWA to any major pipeline is mostly closed.

Flows, if it’s actually a flow and rn I believe only the AA wholly owned have a true flow, are a great backup but should never be the main plan.

All this being said flying an RJ for $100 an hour prbly beats the snot out of working for chicken feed as a CFI unless you have a super sweet CFI or a 135/91K job lined up which would give you multi or even better turbine time. Unless your commute would suck hard, Envoy gives you more options than the Mormons