Originally Posted by
lost_in_translation
IAG's yields will be weighed down quite a bit by Iberia and Aer Lingus, so as you say a straight LH vs. BA comparison would be interesting. For 2017, LH Group 'network airlines' (LH, LX and OS) are 85% of passenger revenue (ignoring the logistics segments, etc.) with the remaining 15% being Eurowings et al. For IAG, BA was only just over 60% of passenger revenues, with EI and IB presumably targeting higher yields than Eurowings but nowhere near the level of LH, LX and OS. VY is obviously in the Eurowings bucket.
With the caveat of not being an expert on this, I had a quick look at the latest annual reports.
BA's 2017 annual report (y/e 31.12.2017) gives a figure for passenger revenue per RPK of 7.51 pence (page 6, PDF page 9)
LH's 2017 annual report (y/e 31.12.2017) gives a figure for network airlines (LH, LX, OS) passenger revenue per RPK of 9.9 € cents (page 43) - the individual LH, LX and OS figures do not state the yield for each airline
Using the exchange rate as at 31.12.2017, I make the LH group network figure 8.79 pence.
Those figures convert to 10.15 USD cents and 11.88 USD cents respectively. Although this is a pretty crude way of approaching things, this suggests that the gap between BA and the LH group network airlines is (as one would expect) a bit smaller than the gap from the IAG group number.