If you are asking this questions then I would really look into why you'd like to work for this airline and you don't understand how 121 world works.

I am sorry but gone are the days of people getting the base they want in training/interview/after IOE. Any airline will assign you to the base they want. Until you show up at the class , nothing is certain.

Know this, you will be much happier person.. Otherwise, stick to the Part 91 world.