We are returning to the airport.
( We ( ( are ( returning ( to ( the airport ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP are) (VP (VBG returning) (PP (TO to) (NP (DT the) (NN airport))))) (. .)))
We will be going back to where the flight departed from.
( We ( ( will ( be ( going ( back ( to ( where ( ( the flight ) ( departed from ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (MD will) (VP (VB be) (VP (VBG going) (ADVP (RB back) (PP (TO to) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN flight)) (VP (VBD departed) (PP (IN from)))))))))) (. .)))