early morning flights between cincinnati and tampa 
return flights ;return #1 which are  in early morning ;return #2 from  cincinnati ;return #3 to tampa ;return #2 from  tampa ;return #5 to cincinnati ;return #3 ,  #4 ,   #5 , #6
['select', 'filter', 'filter', 'filter', 'filter', 'filter', 'union']