I find that LX opens its A fares closer to departure. I can find LH A fares from many markets as early as 10-11 months before departure, while from the same markets LX A fares open up 3-4 months before departure (sometimes 5 months but I never saw reasonable LX A fares available 6-10 months before departure). Similar, LH A seems to be available on short notice (1-3 weeks) while LX A fares close 1 month before departure. But I guess this one boils down to advance purchase requirement.