The FBI yesterday revealed the names of all 19 men who carried out the worst terrorist attack in American history - a loose band of suicidal fanatics with shady backgrounds who lived among us in New York, New Jersey and Florida.

Investigators now know exactly which hijackers were on each of the four doomed planes and have pieced together many of their movements in the months before Tuesday's attacks - crucial clues in the frantic hunt for collaborators.

Some startling details emerged: One killer, Waleed Alshehri, was the son of a Saudi diplomat; another, Mohamed Atta, entered the country despite his suspected involvement in a Jerusalem bus bombing.

Several had suspended visas, others used bogus birth dates, a few claimed to be pilots for Saudi Arabia's national airline. Many were young, single men; a few were married with kids.

Their standard of living ran the gamut.

Mohald Alshehri had a luxurious condo at the private golf club Hamlet in Delray Beach, Fla. But Ziad Jarrahi led a spartan existence when he rented an $800-a-month apartment in the Kensington section of Brooklyn in the mid-1990s.

"There was no furniture, just two mattresses on the floor in the living room, an old computer and a desk," the landlord's son, Jason Matos, told The Post. "My family always joked they might be terrorists."

Most chilling was the realization that the men who marked America for death led quiet lives in its communities, unrecognized as merchants of slaughter even in their final, free-spending days.

"Two guys were in here last week bragging they were Arab pilots - and they spent more than $1,000 in 45 minutes," Gus Renny, owner of the Palm Beach bar 251 Sunrise.

"They ordered several rounds of drinks and then some of our most expensive champagne - a bottle of Krug and a bottle of Perrier-Jouet - and then they invited me to sit down with them," he said.

"When I saw the pictures of Mohamed Atta yesterday, I realized I had been serving drinks to someone who did this terrible thing."

In Delray Beach, sisters Rachel and Nicole Diaz described neighbors Hamza Alghamdi, Ahmed Alnami and Ahmed Alhaznawi as unfriendly men who were always on the go.

"I never once saw one of them smile. You'd get in the elevator and they wouldn't even acknowledge that you were in there with them," 12-year-old Nicole said.

Rachel, 14, added: "They would always be carrying medium-size bags with them. I never saw them without those bags. A lot of people here said they must be drug smugglers."

San Diego neighbors of Nawaq Alhamzi said the hijacker, who had a post office box in New Jersey, shared an apartment with two other Arab men until they abruptly packed up last weekend.

"They were always on a computer - a flight-simulator type of thing with airplanes," neighbor Ed Murray said.

The FBI said five of the men boarded American Airlines Flight 11, which hit the north Twin Tower.

They were led by Atta, 33, an engineer and pilot who attended Hamburg Technical University in Germany before flight training in Florida.

Waleed Alshehri, the son of a former second secretary of the Saudi Arabian embassy in Washington, was on the same jet. A well-trained pilot, he used at least eight different birth dates and lived in Florida and Vienna, Va.

Joining them was Abdulaziz Alomari, 38, a pilot who had claimed to work for a subcontractor of Saudi Arabian Airlines and lived in Florida with his wife and four kids.

The other two were Wail Alshehri, 28, a pilot with addresses in Hollywood, Fla., and Newton, Mass., and Satam Al Suqami, 25, whose last address was in the United Arab Emirates.

United Airlines Flight 175 out of Boston was piloted into the south Twin Tower by five men, including Marwan Al-Shehhi, a 23-year-old pilot from the United Arab Emirates who went to school with Atta in Germany and Florida.

The other four men, Fayez Ahmed, Ahmed Alghamdi, Hamza Alghamdi and Mohald Alshehri, were traced to Delray Beach, authorities said.

The mass murderers on American Airlines Flight 77, which smashed into the Pentagon, included the group from San Diego - Nawaq and Salem Alhamzi, Khalid al-Midhar and Saudi pilot Hani Hanjour, plus Majed Moqed.

Three Delray Beach men - Saeed Alghamdi, Ahmed Alhaznawi, and Ahmed Alnami - were on United Airlines Flight 93, along with Ziad Jarrahi. It crashed in Pennsylvania.

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