According to statistics released earlier this year, travelers lose more than 600,000 laptops a year at the largest and medium sized airports in the country. At the 36 largest airports, more than 10,000 laptops are last a per week.
This means that you need to pay close attention to your laptop when traveling through the airport and especially when going through security. One of the (many) things I hate about going through airport security is the fact that they make you take your laptop out of its case. I think that this just makes it easier for someone else to snatach your laptop.
A solution to this problem is to fly with with a checkpoint friendly laptop bag. If you travel a lot, you might want to look at this list of checkpoint friendly laptop bags. Anything you can do to make your trip through the airport faster and more secure is something you might want to consider.