WASHINGTON (AP) — Once a rite of passage to adulthood, summer jobs for teens are disappearing. Fewer than three in 10 American teenagers now hold jobs such as running cash registers, mowing lawns or busing restaurant tables from June to August. The decline has been particularly sharp since 2000, with employment for 16-to-19-year olds falling to the lowest level since World War II. And teen employment may never return to pre-recession levels, suggests a projection by the U.S. Bureau of Labor Statistics.