A quick google says Boeing is the 28th largest US company by both revenue and market cap (interesting that they line up exactly), sitting next to "pillars" like the Home Depot and PepsiCo.
It takes a lot less skill and knowledge to build another retailer or soft drink company than one that designs and builds cutting edge airplanes.
Arguably, sure. But it's not an engineering argument. The point was responding to comments like "Dumping the stock will hurt pretty much every fund that invested on it, plus Dow will plunge just because of this one stock if it's getting dumped."