Just to clear up a bit of confusion that seems to exist in this thread -
There are three distinct divisions within the bmi (NB it is in the lowercase).
bmi mainline (HQ Donington Hall, EMA. Main base LHR)
The UK's member of the Star Alliance and 2nd largest user of Heathrow
bmi regional (HQ and Main Base Aberdeen)
UK and European scheduled flights using EMB
bmibaby (HQ and Main base EMA)
LCC to UK and European destination using B737
Each division has it's own AOC and operates as an independent airline in the eyes of the CAA. Obviously there is an overarching corporate structure to take advantage of economy of scale.
Recruitment is also carried out independently but there is a migration from bmir and bmibaby to mainline for pilots wishing to make the move. Mainline recruitment is done to a pool and thence
normally onto the shorthaul routes.
Finally within bmi mainline there are three further sections
Longhaul - A330 - USA, Carribean, Saudi Arabia
Mid-haul - A321/ A320 / Damp Leased 757 - Near and Middle East, Africa, Russia
Short Haul - A321/320/319 - UK and Europe.
This is not a definitive list but only intended to give an outline.
Hope it helps
HWB
