Several of the skydivers killed when their plane crashed moments after taking off from a Missouri airfield were experienced jumpers who belonged to a community with a unique bond.

Federal investigators were at the crash site Monday, a day after the plane carrying a pilot and 11 passengers slammed into a field and burst into flames, killing all on board, authorities said.

Some family members of those who died were at the airport to watch the jump and witnessed the crash, said Bates County Sheriff Chad Anderson.

Authorities have not released the victims’ names.

Kevin Payne, who had jumped with seven of the skydivers on the plane, said they were all different in nearly every way, except that they were all brought together as a “sky family.”

“There is a joy and peace and freedom to what we do. That’s what most people never understand,” Payne, of Parkville, Missouri, wrote in an email. “It’s not about the adrenaline. It’s about really flying together with your family in that brief, exquisite instant that people who live their lives on the ground will never understand.”

While it will be about a month before the National Transportation Safety Board issues a preliminary report, weather did not appear to be a factor.

Investigators have interviewed some witnesses, NTSB Vice Chairman Michael Graham said. The plane didn’t have a “black box” like those that record crash data on commercial planes, but investigators will look for other kinds of devices that could provide insights, he said.

Skydiving plane went down soon after taking off

Witnesses say the plane was roughly 100 feet (30 meters) from the ground when it made an abrupt left turn before crashing.

It appeared to be losing power, and the pilot may have been trying to reach a highway to land when the plane stalled and went down nose first, said Dennis Jacobs, acting airport manager of Butler Memorial Airport.

The plane was operated by Skydive Kansas City, he said. The crash site in the small town of Butler is roughly 65 miles (105 kilometers) south of Kansas City.

Skydive Kansas City said in a statement that its team and the skydiving community were in shock.

“This is a devastating loss for everyone connected to Skydive Kansas City and for the wider skydiving community,” the company said. “Our deepest sympathies are with the families, friends, and loved ones of all who were lost.”

Plane made multiple flights over the weekend

The Pacific Aerospace 750XL — a single engine turboprop plane — is a popular model in skydiving because it’s designed for the sport and can quickly take parachutists to jumping altitudes while using short runways.

This particular aircraft, built in 2010, made nine successful flights in the days before the crash, including two on Sunday morning, according to FlightAware, a digital flight tracking company.