A single-engine Cessna 152 and a twin-engine Cessna 340 collided during their final decent into the airport, according to a statement from the Federal Aviation Administration. One person was on board the Cessna 152 and two people were on board the Cessna 340, the FAA statement said.
No one was injured on the ground, the FAA added.
The city of Watsonville is about an hour south of San Jose.
It is not clear what caused the two planes to collide.
This story is developing and will be updated.