it's funny, as we were having this conversation, i was thinking of touring Italy in the early 90s - i probably went in and out of Italian airports maybe 20+ times in a 3 year span and one of my favorite things was looking up at the arrival/departure board and there was a column that said "scheduled time of departure" and another that said "probable time of departure"
these 2 times were often hours apart
now, i loved Italy and it's languid inefficiency, but it was clear that this was no business model that anyone wanted to emulate