The Rialto Municipal Airport where the air show scenes were filmed is about 60 miles down the I-210 from the Chips headquarters. It was a private airport with several business located there including a flight school, helicopter flight school, air ambulance business and an Air Museum.
It was also used by the San Bernardino County Sheriff's Department Aviation Division. The sheriff's department moved their operation to the the San Bernardino International Airport and the Rialto airport officially closed to air traffic in 2014.
This episode has the highest percentage of stock footage to date: aerial acrobatics and crowds watching the show. Also none of the usual car chases and subsequent collisions.