This is defined in policy form AVNIC as meaning ‘from the time the Aircraft moves forward in taking off or attempting to take off, whilst in the air, and until the aircraft completes its landing run.
Insurance Encyclopedia
Flight Coupon Personal Accident Insurance
A Policy protecting individuals as fare paying passengers of a scheduled aircraft from destination to destination including while entering or coming out of aero plane. It is generally obtained at airports.
Flight risks
The risks attaching to an aircraft whilst airborne as opposed to those whilst on the ground.