TSA failed to detect 75 percent of bomb parts at LAX and 60 percent at O'Hare.
The British Airways flight was departing McCarran Airport and headed to London Gatwick.
FiveThirtyEight ranked airports and airlines based on their performance from May 2014 to April 2015.
While TSA agents hunt for liquids and knives, they are failing to find explosives and guns.
Homeland Security Secretary Jeh Johnson has ordered the acting administrator's reassignment.
An internal Homeland Security investigation shows widespread failures by TSA agents.
The plane's landing gear has reportedly been effected due to a technical issue
Chinese military responds with full force over mysterious aircraft.
All travelers returning to the U.S. from Sierra Leone, Liberia and Guinea will be monitored for 21 days, the CDC said Wednesday, and failure to check in will result in "immediate steps to find the person."
U.S. officials said al Qaeda operatives may be developing bombs that could be smuggled onto planes.