The reasons are technical, arising from the way the software processed radar information, as well as from poor primary radar coverage where American 77 was flying.
( ( The reasons ) ( ( ( ( are technical ) , ) ( arising ( ( ( ( from ( ( the way ) ( ( the software ) ( processed ( radar information ) ) ) ) ) , ) ( as ( well as ) ) ) ( from ( ( poor ( primary ( radar coverage ) ) ) ( where ( ( American 77 ) ( was flying ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS reasons)) (VP (VBP are) (ADJP (JJ technical)) (, ,) (S (VP (VBG arising) (PP (PP (IN from) (NP (NP (DT the) (NN way)) (SBAR (S (NP (DT the) (NN software)) (VP (VBD processed) (NP (NN radar) (NN information))))))) (, ,) (CONJP (RB as) (RB well) (IN as)) (PP (IN from) (NP (NP (JJ poor) (JJ primary) (NN radar) (NN coverage)) (SBAR (WHADVP (WRB where)) (S (NP (NNP American) (CD 77)) (VP (VBD was) (VP (VBG flying))))))))))) (. .)))
There are technical reasons behind the confusion surrounding American 77's location
( There ( are ( ( technical reasons ) ( behind ( ( the confusion ) ( surrounding ( ( American ( 77 's ) ) location ) ) ) ) ) ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (JJ technical) (NNS reasons)) (PP (IN behind) (NP (NP (DT the) (NN confusion)) (VP (VBG surrounding) (NP (NP (NNP American) (CD 77) (POS 's)) (NN location)))))))))