It's not clear what gave rise to the references, and federal investigators have found no links to known groups and nothing in the suspect's background to explain them. The New World Order is generally considered to be a conspiracy theory in which people suspect a group of elites is conspiring to form an authoritarian, one-world government.
"He addressed them (TSA officers) at one point in the letter and stated that he wanted to 'instill fear into their traitorous minds,'" FBI Special Agent in Charge David Bowdich said.
In his diatribe, the gunman claimed the TSA treats Americans like terrorists even though all people aren't equally dangerous, a U.S. law enforcement official said.
Wounded victims identified
Both wounded TSA officers were treated and released from hospitals. The TSA identified them Sunday as James Speer, 54, and Tony Grigsby, 36.
The passenger who was shot in his leg was still being treated Sunday at Ronald Reagan UCLA Medical Center Sunday, according to a hospital statement.
Brian Ludmer "remains in fair condition but faces at least one additional surgery for a fractured leg along with extensive physical therapy," a hospital spokesman said Sunday.
Ludmer, a 29-year-old Lake Forest, Illinois, native, teaches stage craft in the theater program at Calabasas High School in Los Angeles County, according to the school's website.
Ciancia is now charged with two felony offenses -- murder of a federal officer and commission of violence in an international airport.
If convicted, Ciancia could face the death penalty or life in prison without parole, the prosecutor said. The U.S. attorney general would decide whether to pursue a death sentence.
'A wonderful husband, father'
Hernandez is the first TSA officer to die in the line of duty since the agency was founded in 2001. He was working as a travel document checker at the time, the TSA workers' union said.
He would have turned 40 next week. His widow described him as a "wonderful husband, father, brother, son and friend."
The chaos also affected more than 165,000 passengers on hundreds of flights as the airport shut down for hours. By Saturday afternoon, all of it -- including Terminal 3 -- had been reopened.
Placement of police questioned
The shooting has stirred questions about a recent repositioning of airport police officers around LAX.
Airport police Chief Patrick Gannon said in the past year, he decided to move officers from behind a TSA security checkpoint to in front of it, where they also took on "greater responsibilities" such as monitoring both the arrival and departure floors of the terminal.
"The threat ... at the airport does not exist behind security at that podium, the threat exists from the curbline on," Gannon said. "So ... we have our people stationed throughout the airport."
He said the nearest police officer to the site of Friday's initial shooting "was just moved to the front part of the airport."
Gannon acknowledged the trade-off of having the officers roam a larger area rather than sit at a checkpoint.
"So are they going to be in the exact same (place), exactly where I'd hoped they would be? No," he said. "It didn't happen in this particular case."
TSA Administrator John Pistole said the shooting has prompted a review of security protocol with partner agencies.
Congressman speaks out
McCaul said better coordination between TSA officers and local law enforcement at the nation's airports could help improve security at those locations.
"I talked to the director of TSA, John Pistole, yesterday. We talked about a review of the policies at airports. Every airport is a little bit different, but the coordination with the local police is key because remember, TSA officers are not armed," he said.