I think that's right, that they are buying yearly while looking at sufficient volumes. It doesn't have to be the best, just very good - and if it turns out that vintage has become the best post-order, then, they look like genuises, or at least, have a bigger budget than they actually do
I think we can put 2008 Dom Rose to one side though given this is LVMH airlines and they have preferential allocation (or rather, products are specially placed with EK).