When I interviewed my Dad this is his answer. After 9/11 all travelers need to accept more strict security checks at airports. The airports need more space to accommodate (more space available) more people because check in and security check lines are longer and luggage is also better controlled. (9/11 affected the world by alerting people about how different people are in the world, because of religion, culture, nationality and race. In September 2011 I had to travel through Miami airport and a simple immigration and security check took six hours. Air traviling seems fun today but its not as fun as it looks.