United Airlines is changing its policy on booking crew on flights in the wake of a passenger being dragged off an overbooked plane. David Dao, who suffered a concussion and broken nose and lost two front teeth in the incident on last April 9, was forcibly removed from a flight to make way for a United crew member. The airline said it would ensure that off-duty crew traveling on its aircraft were allocated seats at least one hour before departure to avoid customers being turfed off flights after boarding. The new rules come as pressure mounts on United to improve its customer service record. Last month the airline was embroiled in a high-profile row after a gate agent stopped two girls from boarding a flight because they were wearing leggings. All passengers on United Express flight 3411 will be compensated equal to the cost of their tickets and could take the compensation in cash, travel credits or miles, United said.