4 that I can remember in a couple of thousand flights. Most recently a couple of weeks ago at LHR in an Air Belgium A340 operating for BA from DXB (previous aircraft not clearing runway). That’s the biggest aircraft on which I’ve experienced it, quite interesting.

I guess it could be a lot more if you were a regular at certain airports. I always appreciate the skill of the pilots who ensure so many landings in difficult conditions don’t require them.