Could it be that bmibaby may use a couple of A319s - A321s from mainline like they did last summer. If bookings and load factos from this summer are anything to go by, at least on the sun routes then i can see it being an option. One of the reasons why they never did this, this season was because of a predicted lack of bookings to these destinations. Well bmibaby among most other UK airlines have been proven wrong and the flights have been almost as popular as ever, hence they increased to two daily during the peak months to AGP, PMI and even FAO.
Aidoair