Broome had an early love for aviation and first soloed a plane at age 17 in 1935. He served as a transport pilot and instructor for the Army Air ForcesAir Transport Command over the North Atlantic during World War II. After the war, he worked as a pilot for American Airlines from 1943-1946. He acquired the nickname the “Flying Rancher” for his frequent use of a Mitsubishi MU-2. In 1985, to mark the 50th anniversary of his first solo flight, the then 68-year-old Broome made a solo round-trip flight across the Atlantic. He continued to fly until he was 83.
In 1998, he sold a painting that he had purchased from his grandmother in 1943. Lost on the Grand Banks was the last major Winslow Homer seascape still in private hands. The painting is nearly and depicts two fishermen in raincoats and hats looking over the side of their small rowboat in choppy seas. Broome was quoted saying, "I love the painting. As a child, I used to admire it. I think it's the most powerful painting in the country." He was reluctant to sell it, but decided, "I'm 80 years old" and "It's time to let go." Microsoft Chairman Bill Gates purchased it for a record price, over $30 million.
Philanthropy
He was involved in a variety of different charitable organizations. He supported and helped launch Casa Pacifica, a home in Camarillo that helps to care for abused, neglected and emotionally disturbed children. He supported and donated to Louisiana State University, his alma mater. In 1999, Broome donated $5 million to help build the library at California State University Channel Islands. He wanted the donation to be private, to stick with his low-key personality, but agreed to let it become public when it was suggested that it may motivate others to donate to the up-and-coming university. This plan worked, according to the then-president of the university, Handel Evans. He stated, "in a matter of weeks, one of our other major donors gave another $5 million. So it did work, and we were very, very fortunate. And Jack was very pleased about it all." Broome later commented in an interview with the Los Angeles Times, "I can't think of anything more worthwhile to be involved in. I have nothing to gain by it, and I don't want anything out of it. The only satisfaction I'll get is to see the university blossom into a major educational institution." The donation was one of the largest in Ventura County. For his generosity, the university named the library after him. In 2005, California State University Channel Islands presented Broome with a Doctor of Humane Lettershonorary degree. It was one of the first two honorary degrees awarded by the university, the other going to Robert J. Lagomarsino.
Other interests
He enjoyed spending time on his yacht, Volunteer, first in San Pedro, then in Channel Islands Harbor, Oxnard. In 1957, he competed in the Transpacific Yacht Race from Los Angeles to Hawaii, his first of three such races.
