all right would you let me know type of aircraft united airlines is using on the flights from denver to san francisco i would like to know the type of aircraft that they use on these flights before 10 in the morning 
return flights ;return #1 on united airlines ;return #2 from  denver ;return #3 to san francisco ;return #4 that are before 10 in  the  morning ;return types of aircraft of  #5
['select', 'filter', 'filter', 'filter', 'filter', 'project']