A preliminary report from the National Transportation Safety Board found indications maintenance errors could be at fault for an American Airlines plane that caught fire after making an emergency landing at Denver International Airport in March.

Investigators say airport cameras captured video showing a trail of fluid following the plane as it taxied after diverting to Denver due to an engine issue. When investigators looked at the plane's engine, they discovered some parts were loose and appeared to be installed incorrectly, with one "allowing fuel to leak from the fitting."

"The way this is looking is that there was a maintenance issue that led to this fire and we've gotta figure out where that error occurred so we can keep that error from happening again," said former NTSB cha

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