Terminal 3, the area where the shooting happened, reopened Saturday afternoon. Passengers who had abandoned luggage to escape Friday's gunfire were allowed to return to collect their bags.
"When challenged, Los Angeles is ready and knows how to respond. This is one tough town," said City Councilman Mike Bonin, whose district includes the airport.
He praised airport police, saying they "saved untold lives" with a swift response that was "absolutely textbook."
As airport operations returned to normal, a few more details trickled out about Ciancia, who by all accounts was reserved and solitary.
Former classmates barely remember him and even a recent roommate could say little about the young man who moved from New Jersey to Los Angeles less than two years ago. A former classmate at Salesianum School in Wilmington, Del., said Ciancia was incredibly quiet.
"He kept to himself and ate lunch alone a lot," David Hamilton told the Los Angeles Times. "I really don't remember any one person who was close to him .... In four years, I never heard a word out of his mouth."
Ciancia, who was shot four times by airport police, remained hospitalized Saturday, but there was no word on his condition. He was wounded in the mouth and the leg, authorities said.
On Friday, Ciancia's father called police in New Jersey, worried about his son in L.A. The young man had sent texts to his family that suggested he might be in trouble, at one point even saying goodbye.
The call came too late. Ten minutes earlier, police said, he had walked into the airport, pulled the rifle from his bag and began firing at TSA officers. When the shooting stopped, one officer was dead and five other people were wounded, including two more TSA workers and the gunman himself.
When searched by police, Ciancia had five 30-round magazines, and his bag contained "hundreds of rounds in 20-round boxes," the law-enforcement official said.
Authorities identified the dead TSA officer as Gerardo I. Hernandez, 39, the first TSA official in the agency's 12-year history to be killed in the line of duty.
Allen Cummings, police chief in Pennsville, a small blue-collar town near the Delaware River where Ciancia grew up, said he's known Ciancia's father — also named Paul — for more than 20 years.
He said the father called him around midday Friday to tell him about texts his family had received.
"There was some things in there that made his family feel he may do harm to himself," Cummings said. He did not mention suicide or hurting others.
The father also heard from a friend that his son may have had a gun, Cummings said.
The police chief called Los Angeles police, who sent a patrol car to Ciancia's apartment. There, two roommates said that they had seen him a day earlier and he had appeared to be fine.
But by that time, shots were already breaking out at the airport.