The share of income in affiliated companies amounted to
MSEK -143 (49). This decline is primarily attributable to the
negative earnings in British Midland
Is that not clear enough? It does not say that the decline in profitability of SK is due to British Midland.
It says "The share of income from affiliated companies <snip> is primarily attributable to the negative earnings in British Midland"
Could not be clearer.
Slot values are not revenue. Even if we accept that slot values should appear on an airlines balance sheet (and many airlines do not agree with this), it might be worth bearing in mind that slot values have only gone down lately and likely to drop further.