well i 'll try last time tell me the kind of aircraft united airlines flies from denver to san francisco before 10 o'clock in the morning
O O O O O O O O O O O O B-airline_name I-airline_name O O B-fromloc.city_name O B-toloc.city_name I-toloc.city_name B-depart_time.time_relative B-depart_time.time I-depart_time.time O O B-depart_time.period_of_day