Yes. They are allowing newhires to pick your base. I dont know if they allow you to pick your equip, but BOS/LGA are only ERJ, LAX would only be able to hold Saab. If you want ORD you could get either the CRJ or ERJ. DFW has the CRJ, ERJ, and Saab. SO:

If you want BOS, yes you can go to the interview and be guaranteed a BOS ERJ spot. We do have a LGA ERJ base, and you could request that as well in your interview. LAX has ERJ and Saab, but the ERJ is about 1.5yrs to hold the bottom slot, so it wouldnt be offered to a newhire. Only the LAX Saab would be available. We are so short of staffing for all equip and bases, so wherever you want to go there will be a need for you there.