a stairway was brought for the rest of the passengers to exit. american surveillance planes are in the air over nigeria joining the search for more than 200 kidnapped schoolgirls. abc's hamish mcdonald has the latest from nigeria. >> reporter: u.s. forces are peering down from surveillance aircraft like this, scouring remote and rugged areas the size of new england in search of the missing girls. the plane is equipped with powerful cameras that give realtime images of the ground as far away as 35,000 feet with this kind of detail. officials can also monitor phone calls below. abc news learned a long-range u.s. drone has also joined the search. this is urgent work for the parents of the missing who have positively identified at least 50 of the girls in this latest video. for all of the attention they have generated it is only now, a full month after the abduction they have what they want, the support of the international community and the full attention