At Great Lakes you could hold MSP right out of training. Great Lakes might not be the most glorious regional, but they do have one of the quickest upgrades.
At Eagle it is hard to know what you will get, but all 4 bases are a one leg commute from ATL. JFK/LGA, MIA, ORD, DFW. All but DFW have some flights on Eagle making it even easier. If we are hiring like they are advertising you could hold any base fairly fast. Expect MIA or NYC out of training.