Runway cameras?
Considering the hundreds or thousands of CCTVs at any major airport it always surprised me that there weren't permanent cameras at each end of each runway and on the tower. Investigators always seem to have to rely on planespotter's footage.
We're going skiing this weekend and as usual I can now look at half a dozen live webcams from the resort to see snow conditions. Seems a bit backward for our technologically advanced industry to not have something similar.
Perhaps they do now but I haven't seen it used in any recent investigations.
It took the Columbia disaster for NASA to set up high resolution cameras on each launch.