(Washington, D.C.) -- Northern Missouri Congressman Sam Graves calls this week's computer outage of a federal flight safety information system a huge vulnerability in the nation- air travel system. Graves, a Republican from northwest Missouri- Tarkio, is the chairman of the U.S. House- Transportation and Infrastructure Committee. The outage temporarily grounded flights around the country Wednesday, affecting more than four-thousand flights. Graves says the FAA outage underscores how understaffed the FAA is currently.