Had a quick look - from what I can tell there is (obviously?) no harm in them being in the plane, the problem is only if they crash.
But, it seems like they stopped doing it in the 1980's anyway so I can't imagine there'd be too many still around - I looked at a selection of airlines and their oldest planes tended to be about 20 years old.
I think the first paragraph is obviously true. Any radiation leaking from this stuff is absorbed in the plane before it gets to me in row 19. If this didn't happen we'd have a bunch of pilots/stewardesses with deformed kids and freaky illnesses. And if that had happened we'd know about it by now.
On the 2nd part, the chances of us been in a plane fire are really really small. The chances that we are in or near a plane fire where this stuff is on board and makes a difference to our mortality rate is just going to be infinitesimally small. Your plane hits the ground and explodes you all die anyway; and this happens whether or not depleted uranium is on board. So the only events where it may make a difference is something like manchester where there is a fire but not everyone dies. Maybe in cases like that there may be a death or two extra or maybe somebody picks up something that causes them to die earlier from cancer. I am not even convinced this will happen but even if it did, it just isn't going to increases your life or flying risks by any noticeable amount.
So there is no need to be scared of it or share it with me on facebook.
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