Just did price check on LCY-DUB return 4-6 Sep.
Get this, on BA website it comes to £178. On Aer Lingus website it states (operated by BA CityFlyer) and for same flight it's just shy of £300!!!
Aer Lingus rip-off pricing never changes!
Then double checked what they'd be on Skyscanner and yep, rip-off price is there too.
1 - They only loaded flights recently, take time for prices to settle down.
2 - It's a code share (for now) you will never get the same pricing, they want you to fly with EI over BA.
3 - Why would you try book with EI?