Okay for April NHs got this:

14 got BWI
12 got MDW
29 got OAK

No other bases were awarded to NHs. So as you can see from the original vacancy, where you get based right out of training has a lot to do with luck. More specifically, where the vacancy openings happen to fall for that particular month.

For example, BWI is a senior FO domicile but because there were 11 openings on this vacancy, a bunch of NHs were able to hold it.