2, 3 or 4 holes, for us the choice is meaningless. We fly 'em, the money-guys buy 'em. The choices aren't ours, just the techniques for safety and comfort (and that's really illusory...we just carry out orders). Now, what'd REALLY be interesting, is a debate on long-haul engine numbers amongst people who matter....Branson, other CEO's of majors, bankers, etc. Then we'd see on what basis these decisions are really made; suppose someone proposed a single-engined ocean-crosser. D'ya think they'd find people to fly 'em? D'ya think Boston priests have uses for little boys?