I'd argue that Tenerife was due to taking off (in bad weather), not landing. But of course, a bunch of planes landing at the same airport without ATC sounds quite dangerous.
There were a lot of contributing causes, but it wouldn't have happened if not for the fact that Tenerife North airport was massively overcrowded due to Gran Canaria airport being suddenly closed (for unrelated reasons) and flights forced to divert.
The issue wasn't with landing specifically; I'm just using it as a general example of issues caused by havoc situations in aviation.
