After he was released, Slater was picked up by a minivan and driven away, New York City Department of Correction spokesman Stephen Morello said. He did not have details on who posted bail for Slater.
Meanwhile, JetBlue said Slater had been removed from duty pending an investigation.
The 38-year-old flight attendant, who on Monday allegedly cursed out an entire aircraft, grabbed a beer and then exited the plane by deploying the emergency slide, appeared in court this morning with a grin on his face.
As JetBlue Flight 1052 from Pittsburgh was taxiing to a gate at New York's John F. Kennedy International Airport, Slater tired to assist a woman who was struggling with her carry-on luggage, his lawyer Howard Turman told a judge in Queens today.
An argument that evidently began in Pittsburgh erupted again in New York, according to Slater's lawyer. Slater believes the middle-aged woman "maliciously" hit him on his head with her luggage, Turman said.
That's when Slater apparently grabbed the plane's intercom and made an expletive-laced speech, grabbed a beer from the galley, opened the door and slid down the emergency evacuation chute.
In a written statement to the Queens County District Attorney's Office, Slater said, "I lost patience after a female passenger had an argument with another passenger and then opened the bin door hitting me on the head without apologizing, I got on the microphone and said, 'To those of you [who] have shown dignity and respect these last twenty years, thanks for a great ride.' I accessed the porthole pulled the door handle inflating the slide, took my baggage and slid down the slide and left."
His lawyer portrayed Slater as a man standing up to a flying public that is out of control.
"This is an example of how airline civility is missing," Turman told the court. "People just don't have courtesy anymore."
Slater's mother, Diane Slater, a retired flight attendant interviewed at her home in Thousand Oaks, Calif., by ABC News station KABC in Los Angeles, defended her son.
"I don't think he's going to be in trouble very long," she said. "I think he just had a very small meltdown, and I think he deserves to be able to have that meltdown if you saw the egg on his head where he got smacked."
Diane Slater told the station that the passenger should face charges for interfering with an airplane crew member, her son, and "smacking him in the head."
"I can understand why he snapped, and I would have snapped too. In fact, I probably would have snapped more than he did," she said. "I also don't think that people who are in the service industry should be abused by anybody, whether it be a passenger or anybody."
Slater apparently talked freely to police at JFK about the incident, including at one point "flamboyantly" reenacting the event, police sources told ABC News.
Besides the in-air stresses of his workplace, Slater appeared to have a lot else going on in his life.
He told police that his father died recently and his mother has cancer, police said.
After the run-in with the passenger, Slater was sent to the front seating area of the plane where he was seen drinking freely, police said. Then he got on the public address system and made his dramatic exit.
Slater then reportedly took the airport's AirTrain to an employee parking lot and drove to his nearby home, where police later arrested him.
Police said the passenger had no intent of hitting the flight attendant with her suitcase. She did not commit a crime and was simply guilty of rudeness. The police hope to interview the woman as a formality, but had not done so by midday today, according to sources.
Heather Robinson was a passenger on the flight and was surprised by the PA announcement. She hadn't seen the fight or the slide deploy.
"I just thought it was just someone who was angry and was just giving what you would imagine as a fantasy quitting speech," Robinson told ABC News. "It is the thing that everyone fantasizes about, quitting in a dramatic way I guess."
"He sounded like he was fed up," she added. "Not angry, so I wasn't scared or anything."
Robinson said she doesn't condone what Slater did but understands where he was coming from.
"I had empathy for him. He wasn't threatening or anything," she added. "It was clear to me that was just a person sounding off."
Police say that Slater could have killed or severely injured somebody on the ground with his escape. The emergency slide deploys out of the aircraft with a force of 3,000 psi. The typical car tire pressure is around 30 to 35 psi.
When asked about possibly killing somebody on the ground, Turman replied: "There's a window. He's worked in this industry for years. He knows the correct procedure."
The cost to replace the chute, according to the police report, is more than $25,000. Additionally, JetBlue could lose tens of thousands of dollars more, while the jet out of service for repairs.
Passenger Phil Catelinet said that as the plane was taxiing to the gate, it stopped and several passengers got up to get their bags. One of the flight attendants announced that the plane was not quite at the gate yet and asked everyone to sit down.
He then heard Slater on the overhead sound system say, "I've had it."
A few minutes later on the AirTrain, he saw Slater.
"I recognized him from the flight; it looked like he had a cut on his forehead. I recognized his voice when he started talking to another passenger from our flight about how he'd just had enough and quit his job," Catelinet wrote on his blog. "Then he said something about someone using the emergency slide to get off the plane. I still wasn't sure what had happened. I thought a passenger had taken the fun way out."
Catelinet said Slater was telling another passenger on the train that he was fed up with this passenger who had a bag problem.
"He said something like 'your bag's right here!' and mimed pulling the emergency slide," Catelinet wrote.
Slater, who lives in the Belle Harbor section of Queens, New York, has been charged with criminal mischief, reckless endangerment and criminal trespass. Besides setting bail, Judge Mary R. O'Donoghue signed two orders of protection: one for Steven Gullian, the captain of the JetBlue flight and another for June Donovan of JetBlue security. Both gave witness statements to the police.
JetBlue would not say how long Slater has worked for the airline, but his LinkedIn profile says he worked as a flight attendant since 1994, when he worked for the former Business Express. He also worked for the now-defunct TWA and for Delta, then apparently had a job as the Burberry accessories shop manager at Bloomingdale's.
According to the profile, at JetBlue he is a member of the "inflight values committee" and is the chairman of the "uniform redesign committee."
Turman, his court-appointed lawyer, said today that Slater has been dedicated to the airline industry since he was 19 years old and that he lost friends in the crash of TWA Flight 800 and in the 9/11 attacks.
"I found him to be personable and gentle," Turman said. "I think he can't believe the amount of attention this is getting."
ABC News' Andrea Canning, Richard Esposito, Desiree Adib, Sharde Miller, Jean Shin, Shimon Prokupecz, Michael S. James and Dean Schabner contributed to this report.