A study by eleven graduate students from the University of Pennsylvania showed that Philadelphia should have considered bidding for the 2024 Olympics. The study said that one of the city's biggest challenges would be convincing the voters who select the host city that Philadelphia is a "world-class city", something that "will require strategic changes in the city’s landscape in conjunction with a persuasive marketing strategy". The study mentions that when arriving in the city from Philadelphia International Airport, it is difficult to find a route that does not have abandoned oil tanks, old structures and thousands of tons of waste. One good thing about having the Games in Philadelphia is that it is near many large cities.