TEHRAN - "Any plane not up to standard in safety requirements will be denied flight permission," said Head of Iran's Aviation Organization, Ruhoddin Abutalebi on Thursday in an interview with IRNA on the occasion of International Aviation Day.

Abutalebi warned that Iranian airlines not abiding by international regulations would be closed down.

He also noted that the pilot and crew must be in good mind and have sufficient professional knowledge, adding that 70-75 percent of plane crashes happens due to human errors.

Meanwhile, Abutalebi announced that a plan is underway to enhance air transportation safety in Iran.