They've since raised it to $250,000/yr to get it, and you can't get it with a corporate card, unless you have an AMEX "small business" corporate card. I went through a lot of this shit when Visa started breaking my balls about charging construction supplies on the Visa. We were spending like $50K / month so I figured what the fuck, let's see if we can get the black Amex. But we use Amex as a corporate card, too. I'm still trying to work out that situation.
A 767 is about $100M, new. I'm not sure how much a 747 is.