The subsequent investigation revealed Reveal_secret that due to pilot error , inadequate de-icing procedures at LaGuardia , and several lengthy delays , a large amount of ice had accumulated Come_together on the wings and airframe .

The dissenting report Reporting led to delays Change_event_time in changes Change to de-icing procedures , with a thin layer of ice causing Causation the deadly crash Catastrophe of Air Ontario Flight 1363 in Canada in 1989 .