show me all flights direct only from boston to san francisco or oakland that arrive before 10am local time 
return flights ;return #1 which  are direct only ;return #2 from  boston ;return #3 to san francisco ;return #3 to oakland ;return #4 or  #5 ;return #6 which  arrive before 10am local time
['select', 'filter', 'filter', 'filter', 'filter', 'union', 'filter']