Mumbai, Feb. 4 -- The wingtips of Air India and IndiGo aircraft came into contact at Mumbai airport on Tuesday evening, and both planes have been grounded for checks, officials said. All passengers are safe. Air India flight AI 2732 was waiting on the taxiway before take-off while the IndiGo flight 6E 791 was taxiing after landing. Both were Airbus A320 aircraft.HTC...