Yes, the luck starts coming into play as soon as you land.
They will make you wait until the bus fills. Somtimes it takes off right away, sometime you wait a very long time. They don't take off until the bus fills up. They don't tell you when they're leaving because they have no clue either. It's whenever the next flight comes in.
This comes with almost all of the airport/hotel shuttles though. It's the cost of going to your hotel for $7 + tip($1).