The ATR72-500 is rated for LCY, whereas the -200 is not. Aer Arann got the -500 cleared for LCY for its IOM-LCY route, but IIRC an ATR42 was used when push came to shove.
As for BA adding GCI and JER from LCY, the question is whether there are decent slots available at LCY that would be required for a business oriented route. And of ocurse another question is whether BA would be willing to overnight planes at JER and GCI as otherwise the route would not be very attractive.
Last edited by virginblue; 12th May 2013 at 22:45.