OK, if air bridge(s) were installed I'm assuming AAL would want them to be fully utilised and with half the traffic that currently uses the airport being incompatible with them (i.e. J41, S20, E45, DH4) then it would seem a bit of a pointless exercise.
An airbridge would only be of use on stand 7 where the BA Airbuses park at usually and is it worth carrying out extensive modifications to the terminal to accommodate this one bridge? I think not.