Now if it'd been a couple of -400's in the LAM hold, above one another, 1000' apart, and both turning at the end of a leg, then it'd be starting to get a little close! I remember from a previous life sitting like that above a BA -400 one clear winter's morning, doing a few laps, and was impressed each time as his winglet came up towards us! What a beautiful sight - just wish I'd had a camera handy.
I wish this bloke hadn't had a camera handy.....
p.s. Well spotted, RealFish. Well spotted indeed.