The issue of AD's is a re herring, WW fleet is leased and most are due to expire in the next 24 months, WW is only responsible for AD that fall within the lease period, unlike LH or Jet2 who own their classic fleet for there is no value with out the AD's having been completed, LH are already carrying out this work including replacing crown skins
No major investment is required to lease newer 737 or A319's LH are very logical and understand the strategy game well bmi have a major problem with it's focus on Arab and North Africa for sure but that applies to Austrian as well mean while WW have the lowest seat cost per mile in the LH group
Time will tell