Whilst the focus of this thread in recent days has been in respect of the various London destinations, it should be noted that, yesterday, Aer Lingus resumed flights to/from Dublin after an absence of a week short of two years. The Aer Lingus Regional service is now operated by Emerald Airlines. Currently, the Aer Lingus website only offers Dublin as a destination so onward connections (North America etc) will need to be booked separately.
Initially, weekday flights to Dublin are timed to depart at 10.40 a.m. but from 28th March, they move to 16.45 p.m. so no chance of same day transatlantic connection. Still, U.S pre-clearance in Dublin is a positive.