From an air traffic controller's perspective, that meant maintaining a safe distance between airborne aircraft.
( ( From ( ( an ( air ( traffic ( controller 's ) ) ) ) perspective ) ) ( , ( that ( ( meant ( maintaining ( ( a ( safe distance ) ) ( between ( airborne aircraft ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN From) (NP (NP (DT an) (NN air) (NN traffic) (NN controller) (POS 's)) (NN perspective))) (, ,) (NP (DT that)) (VP (VBD meant) (S (VP (VBG maintaining) (NP (NP (DT a) (JJ safe) (NN distance)) (PP (IN between) (NP (JJ airborne) (NN aircraft))))))) (. .)))
There isn't any control of flying patterns for aircrafts.
( There ( ( ( is n't ) ( ( any control ) ( of ( ( flying patterns ) ( for aircrafts ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (RB n't) (NP (NP (DT any) (NN control)) (PP (IN of) (NP (NP (VBG flying) (NNS patterns)) (PP (IN for) (NP (NNS aircrafts))))))) (. .)))