(AP) Pennsylvania school districts are struggling with a shortage of bus drivers. A decline in the number of licensed school bus drivers statewide has some districts scrambling to get students to and from school, a situation that has gotten "progressively worse,'' according to Mike Berk, executive director of the Pennsylvania School Bus Association, which represents companies that provide districts with busing services. Nationally, 24 percent of school districts reported "desperate'' or "severe'' driver shortages in a survey by School Bus Fleet, an industry trade publication. Statewide, the number of licensed school bus drivers has declined from 46,000 in 2013 to 44,000 last year.