ATHENS, Greece (AP) — A general strike in Greece called in response to a rail disaster last month grounded flights and extensively disrupted services, with protests in cities across the country planned for Thursday. The strike also kept ferries to the Greek islands at port, left public hospitals running with emergency staff, halted public transport services and led to class cancellations at state-run schools. Unions have rallied behind railway workers’ associations that have staged rolling walkouts since the head-on train collision in northern Greece on Feb. 28 that left 57 people dead and dozens injured.