The sudden and surprising closure of airspace over El Paso, Texas this week snarled airport operations and led to questions over what led to the confusion. The FAA imposed a temporary flight restriction, or a TFR, in a 10-mile ring around El Paso International Airport on Tuesday. That TFR impacted operations both at the airport and at Fort Bliss, one of the U.S. Army’s largest bases. While the order was lifted Wednesday morning, questions remain over what caused the issue to arise.