A PIA Jumbo plane with 421 passengers onboard aborted take off from Karachi Airport as a bird hit one of its engines, a spokesman of the Airlines said here on Friday. He said that the plane was about to take off when the incident occurred and it aborted the take off.The flight PK 302 was scheduled to leave for Lahore at 8.00 a.m. The PIA spokesman said that all the passengers onboard are safe and that the technical staff is checking the affected engine.