find me the earliest flight from boston to atlanta and the latest return to boston on the same day 
return flights ;return #1 from  boston ;return #2 to atlanta ;return the earliest of #3 ;return returns ;return #5 where the day is  the   same as #4 ;return #6 to boston ;return the latest of #7 ;return #4 , #8
['select', 'filter', 'filter', 'project', 'select', 'comparative', 'filter', 'project', 'union']