Two men who died after their helicopters collided midair in New Jersey over the weekend both received their pilot licenses later in life and would often have breakfast together at a cafe near the crash site before taking to the skies from the local airport.

Authorities on Monday identified the two New Jersey men as Kenneth Kirsch, 65, and Michael Greenberg, 71. Witnesses told police that the two helicopters they were piloting Sunday were flying close together just before they crashed in a farm field near the airport in Hammonton, about 35 miles (56 kilometers) southeast of Philadelphia.

Hammonton Police Chief Kevin Friel said in a statement that Kirsch, of Carney’s Point, was pronounced dead at an area hospital after being flown there, while Greenberg, of Sewell, died at the crash site.

Investigators with the National Transportation Safety Board were examining the accident site on Monday and determined the debris field is about 100 yards (91 meters) long and contains parts of the main rotors and tail rotors, a spokesperson said. Both helicopters are expected to be removed from the site Tuesday and taken to another location for further review.

A preliminary report is expected in about 30 days, the NTSB said.

Friel said rescuers responded to a report of an aviation crash at about 11:25 a.m. Sunday. Video from the scene shows a helicopter spinning rapidly to the ground. Police and fire crews subsequently extinguished flames that engulfed one of the helicopters.

The Federal Aviation Administration described the crash as a midair collision between an Enstrom F-28A helicopter and Enstrom 280C helicopter near Hammonton Municipal Airport. Only the pilots were on board.

Kirsch and Greenberg both received their pilot licenses in 2014, FAA records show. They often stopped at the Apron Cafe next to the airport for breakfast before flying, said the restaurant's owner, Sal Silipino.

Silipino said Kirsch and Greenberg ate at the cafe shortly before the crash. Patrons watched the helicopters take off from the airport and were stunned when the aircraft fell from the sky, he said.

“It was shocking. Still shaking to see that happen,” Silipino said. “They were just at our café having breakfast. They’re regulars. They come in every week or every other week. They fly in together. They seem to be very nice people. They were also very kind to the workers and staff and all.”

He said the helicopters' flights appeared to begin without incident.

“I saw one go down and then I saw the other one go down and there was little bit of disbelief. It’s like, is that really happening?," Silipino said.

FAA records show Kirsch was the registered owner of one of the helicopters, while the other aircraft was registered to M&M Charter LLC of Mountville, Pennsylvania. Contact information for M&M Charter could not be immediately found Monday.

Hammonton resident Dan Dameshek told NBC10 that he was leaving a gym when he heard a loud snap and saw two helicopters spinning out of control.

“Immediately, the first helicopter went from right side up to upside down and started rapidly spinning, falling out of the air,” Dameshek told the TV station. “And then it looked like the second helicopter was OK for a second, and then it sounded like another snap or something ... and then that helicopter started rapidly spinning out of the air.”

Hammonton is a town of about 15,000 people located in Atlantic County in the southern part of New Jersey. The town has a history of agriculture and is located near the Pine Barrens, a forested wilderness area that covers more than 1 million acres (405,000 hectares).

Investigators will likely first look to review any communications between the two pilots and whether they were able to see each other, said Alan Diehl, a former crash investigator for the FAA and NTSB.

“Virtually all midair collisions are a failure to what they call ‘see and avoid,’” Diehl said. “Clearly they’ll be looking at the out-of-cockpit views of the two aircraft and seeing if one pilot was approaching from the blind side.”

Although it was mostly cloudy at the time of the crash, winds were light and visibility was good, according to the weather forecasting company AccuWeather.