find me the earliest flight from boston to atlanta and the latest return from atlanta to boston within the same day 
return flights ;return #1 from  boston ;return #2 to atlanta  ;return the earliest of #3 ;return returns ;return #5 from  atlanta  ;return #6 to boston ;return #6 where the day is  the   same as #4 ;return the latest of #8 ;return #4 , #9
['select', 'filter', 'filter', 'project', 'select', 'filter', 'filter', 'comparative', 'project', 'union']