CHECKING IN: Police officers watch over would-be passengers entering Hasanuddin Airport in Makassar, South Sulawesi, on Wednesday. Hundreds of airport workers have gone on strike to press demands for a pay increase and social security insurance. (JP/Andi Hajramurni)Airport workers staged strikes at five airports Wednesday due to continued disagreements between state-owned PT Angkasa Pura I and its labor union over salaries, pensions and health insurance. The coordinated six-hour strikes hit Sepinggan Airport in Balikpapan, East Kalimantan; Frans-Kaisiepo Airport in Biak, Papua; Hasanuddin Airport in Makassar, South Sulawesi; Sam Ratulangi Airport in Manado, North Sulawesi; and Pattimura Airport in Ambon, Maluku. Sepinggan Airport workers, dressed in black shirts with the words "We're on strike", started their strike at 6 a.m., disrupting airport operations until 1...