California’s wage statement law (Lab. Code 226) applies to workers based in California who do not work half the time in a different state. Here, the plaintiff airline crew members were based in California, beginning and ending each sequence of flights there. They did not spend half their work time in any other state, so California’s wage statement law applied to them. The court need not review the evidence on a pay period by pay period basis to determine if in any given pay period a worker worked half his or her time in another state but may consider the evidence on an aggregate basis to determine whether the worker works in any particular state half the time. Neither Wage Order No. 9 nor federal law (Airline Deregulation Act or Railway Labor Act) preempt Lab. Code 226. Nor does Lab. Code 226 violate the dormant Commerce Clause.