Iraqi aviation authorities have been left red-faced after a 10-year-old boy on his own boarded an Iran-bound plane from a busy airport in a the Shia holy city of Najaf, south of Baghdad, after several security checks. The international airport said on Wednesday it would review security after the boy passed under the radar of seven checks, mixing in with large crowds of travellers. The child was only intercepted after boarding an Iran Air-chartered aircraft, airport manager Hikmat Ahmed told AFP. About five hours after his arrival at the airport on Monday night, “the plane crew contacted us abo…