Why the British Accent?

We picked up my parents from the Minneapolis/St. Paul International Airport the other day. After parking the car in the ramp, we had to take the "tram" to the terminal. So all along the way, there is this woman's voice telling you stuff and she has a British accent.
"You have pocked in the red zone."
"The tram is about to de-pot..."
Why the British Accent? We're in Minnesota! If I go to London will I hear a Minnesotan say, "The train is about to leave you betcha!"???