to AIRFORCENONE and STABTRIM,
I dont really think you have an argument in justifying the 319 just because it has Cat 3 capability and teh Embraer doesnt , having flown both types , i can assure you that in five years I used Cat 3 in anger in the 319 once, - this will hardly justify its operating costs being above that of the 145.
As far as STABTRIMS comments about 20 rosta changes a month, being called constantly when not on standby - well the latter might happen occasionally , especially since manx was grounded, and we were providing cover, One C/crew ? - never, rostas are stable now and dont see any reason why they wont continue this way..