At the car rental hall in San Francisco Airport, we waited in a very short line before reaching the counter. The staff was very friendly. However, we had booked a Ford Edge SUV, but the staff at the counter told us that it was no longer available and insisted we upgrade to a Dodge SUV for an extra $5 per day. We saw similar complaints online before our trip, but had no choice but to pay the extra and take the car. However, when we got to the pick-up area, we saw a Ford Edge available, which left us feeling quite upset. It turns out that even big companies like AVIS in the US aren't always reliable.