It’s midmorning and hundreds of people are squeezed under a banyan tree’s shady canopy to have blood drawn by just three nurses, working assembly-line fast. Others wait outside this dusty rural health center to get their vitals taken and give urine samples.

Several hours of searching Indonesian waters turned up no sign of an AirAsia plane that disappeared Sunday with 162 people on board in airspace possibly thick with dense storm clouds, strong winds and lightning, officials said.