Shuttle service is extremely low in frequency. Hertz, enterprise and even dollar have a great frequency of busses. There is always a long wait to get your car even at odd hours.
Yes consider the size of the airport, its normal for Avis.
The Avis app has a "track shuttle" feature. I never used it but if it works, you can time yourself to meet it.
15-20 mins. Yes its that slow, other services will show up at least twice before the 2 busses avis runs.
Absolutely! However it depends on the time of the day you arrive. It's a very busy place.
Usually every 15-20 mins
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