Based purely on a back-of-the-envelope calculation, using approx number of hours to fly distances and looking at just the new routes announced from Bari and Brindisi, this leaves on average the Bari aircraft each in the air for about 8 hours per day, while the Brindisi aircraft should be in the air for about 5 hours per day - rather low utilisation rates for short-haul aircraft operated by a LCC
I'm sure someone else out there can do a better job with flight schedules, but it suggests that either further routes / increased frequencies on existing routes will be announced from Bari and Brindisi, or alternatively these aircraft are being deployed in a way to free up aircraft based elsewhere in Europe.