It is totally conceiveable that the routes could be seasonal for EIR, when demand may be greater. It is a reasonable question.
Aer Lingus Regional when launching the routes stated they were providing 3 daily flights to BHX (6 in total) and 2 daily flights to MAN (5 in total) to give additional feeder traffic to the USA operation as well as to broaden the choice for Business and Leisure passengers on both these Aer Lingus routes which are two of the busiest between Ireland and the UK, this is long-term not short-term gain for Aer Lingus Regional.