US air authorities ordered an hours-long grounding of flight departures nationwide Wednesday following an outage affecting a key system used by pilots before takeoff. The Federal Aviation Administration said that normal operations were resuming gradually as airlines warned of lingering delays. Joshimath, the sinking town in Uttarakhand is on the brink of disaster with cracks in hundreds of buildings. The scale of the damage is most visible at the residential campus of a power plant operated by the Jaypee Group.