Delhi-bound flight delayed by 4 hrs due to hoax bomb threat
 An Ahmedabad-Delhi Vistara flight was delayed by four hours today due to a hoax bomb threat, a senior aviation official said. The hoax threat was made to the Vistara call centre in Gurugram, following which a Bomb Threat Assessment Committee was convened. The flight underwent a security drill, while Vistara told passengers it was delayed due to "mandatory security checks". 