This isn't so far fetched. Many security cameras can be viewed publicly online.
For example, here are few showing the field of an airport.
155.31.20.201
87.54.59.228
It could easily be ported as an application on the iPhone, or any other phone.
Other airport cameras are more secure, such as this, which requires a username and pass.
195.243.185.195
@MSD, here is one with a control panel if you want to have some fun.
216.14.254.20:90
So basically, this is in no way related to hacking. It's just some old google trick.
All you have to do is google search the following: inurl:view/index.shtml airport
Of course you can replace airport with any place you would like to check. For example, if you want a security camera on the beach, you search: inurl:view/index.shtml beach