[3] He graduated from Yamhill High School in 1935 and from Linfield College in McMinnville, Oregon, in January 1939.
[4] In 1941, Jernstedt was recruited to join the Flying Tigers to fight the Japanese in China, resigning his Marine Corps commission (with the secret approval of the US government).
[4] In his Flying Tigers career, Jernstedt was credited with an additional three victories, for a total of 10.5.
[4] Returning to the United States, he joined Republic Aviation as a civilian test pilot.
He bought the Hood River Bottling Works, a soft drink bottler that he ran for 25 years.