剛剛下飛機不算“become a resident”。

現在網絡很發達，加州法律公開程度比別的州好許多，很多日常法律問題自己在網上查一下就出來了。

http://apps.dmv.ca.gov/pubs/hdbk/ca_dl.htm

New California Residents

When you become a California resident and you want to drive in California, you must apply for a California driver license within 10 days. Residency is established in a variety of ways, including the following:

Being registered to vote in California elections.
Paying resident tuition at a California college or university.
Filing for a home owner's property tax exemption.
Receiving any other privilege or benefit not ordinarily extended to nonresidents.