Vegas: ordering a tax "to a hotel" - hotels have different entrances, pickup / dropoff there during crazy times is hard. Uber UI for Vegas is unique / some features are designed to make it easier for driver and passanger to find each other

Airports: different regulations, different rules for pickup/dropoff. Also scammers who pretend to be in a car, walk with their phones around pick-up ares in airport and do bait-and-switch (saw that in Istanbul SAW and in Dubai Al Maktoum)