The 54-year-old great-granddaughter of former New York City Mayor William Jay Gaynor was among the six people who perished in the crash of a small plane in Texas.

Angela Webb Kensinger was killed along with her husband, Stuart Roben Kensinger, 55, according to the Texas Department of Public Safety.

According to a 1989 wedding announcement in the New York Times, Webb Kensinger was the great-granddaughter of Gaynor, the 94th mayor of the Big Apple from 1910 to 1913.

Gaynor survived an assassination attempt early in his term when he was shot in the throat by a discharged dock watchman aboard the SS Kaiser Wilhelm der Grosse, which was docked in Hoboken, NJ.

He died of a heart attack aboard the RMS Baltic on Sept. 10, 1913, and was buried at the Green-Wood Cemetery in Brooklyn.

Webb Kensinger, a graduate of Yale, also was a descendant of railroad and shipping magnate Cornelius Vanderbilt, according to the wedding announcement.

Her husband, also a Yale grad, was a Houston real estate investor and co-director of the Jerusalem Peacebuilders, an interfaith nonprofit organization that seeks to unite Israelis, Palestinians and Americans.

The twin-engine Beechcraft BE58 that plunged into rugged ranchland about 70 miles northwest of San Antonio on Monday was piloted by 65-year-old Jeffrey Weiss, a philanthropist who regularly volunteered to transport people in need of medical care.

The experienced pilot, an investment banker with Raymond James, volunteered for Angel Flight South Central, a nonprofit that provides free flights to sick people, as well as the group Pilot & Paws, which helps transport animals in need of sheltering and adopting, according to KTRK-TV.

Weiss co-owned the plane with Charles Morina of Dallas, according to FAA records.

The plane took off from West Houston Airport in Katy about 7:30 a.m. and crashed about 10 miles from its destination at the Kerrville Municipal Airport, FAA officials said.

The three other passengers, all from Houston, have been identified as Mark Damien Scioneaux, 58, architect Scott Reagan Miller, 55, and landscape architect Marc Tellepsen, 45, officials said.

Scioneaux, who worked in architecture and planning for Tellepsen Landscaping, was the husband of Houston Ballet artistic director Stanton Welch, according to KTRK.

The Tellepsen family said they believe an architectural client had chartered the plane for a short trip to survey some property when it crashed.

“The family of Marc Tellepsen is extremely grateful for the outpouring of support from our friends, family and fellow Houstonians at this incredibly difficult time. We hope you understand our need for privacy as we grieve for the loss of our husband, father, beloved family member and friend,” the family said in a statement late Monday.

The cause of the crash hasn’t been determined, but witnesses heard the plane struggling moments before it crashed.

“It was making a sput-sput sputtering sound, like the engines were cutting out,” Treva Hardeman, who was working at home about a quarter-mile from the crash site, told the San Antonio Express-News.

“It was just a few seconds later that I heard the boom,” she added.

Construction worker Rodney Simmons said he heard a plane “struggle against the wind.”

“I looked over and watched him drop down out of the clouds,” Simmons told the Express-News. “The rear end of the plane was real low, like he was trying to stay in the air. It was like he was dragging the tail end of that plane. Like he had a lot of weight in the back or something.”

The plane flew southward into the wind, he said, then “banked to the right, real hard, and just flipped on over, upside down, and nose-dived to the ground.”

With Post wires