It is far easier to get hired at Endeavor, Silver, Envoy than it is to get hired at Delta/American/United.
At one point in my career, I had an interview at Delta...and nowhere else. None of the regional/commuters would even interview me.
Pretty soon we will be back to the 1960s, when UAL hired HS students with a private license and paid for their all of their training...they got UAL numbers as soon as they were hired out of High School.