Quote: "I think you'll find that BA merging with LH would lead to a monopoly enquiry which would almost certainly be vetoed by UK, German and EU regulators"
Indeed there is no way that regulators would allow any of three large European carriers, BA-IB (IAG), AF-KL, and LH-SN-OS-LX, could merge with eachother, in any combination.
For now they'll have to content themselves by taking over smaller carriers.