aviation

Milk run flights (where a plane makes many stops along a route to serve multiple locations) have become less and less common with the rise of longer range planes. You only really see them in remote places nowadays where there isn't enough people to justify separate nonstop flights. But I think there's a certain charm to them that the avgeek in me loves. But most importantly, these flights can well be the only means of long distance travel to and from some remote places so they're extremely important.