Ghost in the ShellCertainly the idea of a "cruising altitude" anywhere was a tempting notion. But even or maybe especially at 30,000 feet, there were bumps: Solicitation for credit cards, travelers anxiety seeping out of tapping appendages and shoved into overhead compartments, "naturally" flavored water that smelled like a scratch and sniff of Barbies bathroom, the literal parade of one class behind another, warm nuts for some, cheese in plastic for all, catapulting