i need to spend much of a day on the ground in atlanta find me an early flight from boston and the lastest possible flight back from atlanta 
return flights ;return #1 from  boston ;return #2 to atlanta  ;return early #3 ;return #1 from  atlanta  ;return #5 to boston ;return lastest #6 ;return #4 , #7
['select', 'filter', 'filter', 'project', 'filter', 'filter', 'project', 'union']