I'am from Austria, but i can't imagine how this can happen. So prior your journey you decide what city you wanna visit, therefor choose the airport. So if you wanna go to sidney you will google for sidney airport but not Salzburg nor Vienna?
A coworker has done this. He said he was trying to find the cheapest flights and didn't realize the list changed from Australia to Austria. He realized right when the plane was about to take off because a flight attendant said the destination.
He also said he missed his brother's wedding but had far more fun in Austria lol