All airports come from the Southern California region and it contains the following airports as stated on ORBX’s forums:

KAJO, Corona Municipal Airport, Corona, CA – Dubbed the “Friendliest little Airport in America”.

KAVX, Catalina Airport, Avalon, CA – Restaurant at the airport has a specialty of Buffalo burgers.

KEMT, El Monte Airport, El Monte, CA – last the airports in the San Gabriel Valley.

KRIR, Flabob Airport, Riverside/Rubidoux, CA – the seventh oldest surviving airport in California, the “aviation nuts” their call themselves “Flabobians”

KVNY, Van Nuys Airport, Van Nuys, CA – ranks as one of the world’s busiest general aviation airports.

L35, Big Bear City Airport, Big bear, CA – Low fuel price, friendly airport workers and good restaurants.

L52, Oceano County Airport, Oceano, CA – Within walking distance of the Pismo Beach sand dunes.

It requires the latest ORBX Libs file and the link can be found on their forums here