BA
Also if BA took over the DUB-LHR route, they could have say 3 services a day but on a bigger aircraft (A321,767,787) ? That way they could still maintain the profitable DUB route but yet still have slots available for expanding it's long haul network out of LHR ?
A route like DUB requires frequency over aircraft size. Even EI have moved from nearly all A321 flights to nearly all A320 flights. Just 3 flights a day would mean long long layovers between connections and would be massively unattractive to business travellers who need both flexibility and frequency.