I was on a SEA-DFW 757 a couple of months back. We boarded at 2L, which for a DFW-based flyer, was nice to see! A few of us ordered Heinekens for our pre-departure bev. When I asked for one after take-off, I was told there were none left. Bear in mind this is a 3.5-hr flight (eastbound). Is it typical to have only 3 or 4 Heinekens on flight of this length, with potentially 22 FC pax? (This was the dinner flight, during which alcohol consumption may be even more prevalent.)