Last year I flew Emirates to New Zealand. In their inflight magazine was a graphic on their wine cellar. I won't reproduce it, but these are some of the figures:-
Of all wines consumed on board*
7% in first class
41.5% in business
51.5% in economy
*Champagne is most popular choice in first & business.
57% of all wines consumed on board are from Bordeaux
Annually they spend
$65.4M on current wines and spirits
$22.65M on first & business class Champagne
1.2M bottles are maturing in their wine cellar in Burgundy