I agree it is poor, but is just a reflection of a lack of anticipated demand at the moment. Other domestic routes have suffered similarly. Looking randomly at a few dates from October to December, at Newcastle there is no late flight back to London, and Manchester doesn't have a late flight back on some days.

The schedules from Belfast from January onwards shows a later flight so hopefully things will start to get more back to normal soon.

The addition of the London City flights is certainly very welcome. I'm surprised they didn't try it earlier when Flybe seemed to be doing well on the route

As LondonAddy says it does compare well to the recent timetable. At one point a few months back it went as low as zero BA flights and one EI flight per day (I'm not even sure if it was every day).

Overall I think the acquisition of Aer Lingus has been bad news for those flying to or from Belfast City. At the time they took them over I think there were six or seven daily BA flights and three EI flights to Heathrow, as well as three EI flights to Gatwick. IAG had to make available slots for competition and of course these were largely provided by ending the Belfast to Gatwick flights.

BA have reduced the number of their own flights to a 'normal' of four a day, relying on the three EI flights to plug the gaps. The unfortunate thing for anyone who wants to fly BA is that their BA status will get them very little on EI. There is no business class on EI, and to book EI under a BA codeshare in economy usually involves paying a lot more than for an EI coded flight or the BA own metal flights. EI are also poor for connections to other BA flights at Heathrow as EI land in Terminal 2. Avios redemptions on Aer Lingus between Belfast and London are poor value due to high tax and charges and the lack of Reward Flight Saver.