Staff made the discovery on Tuesday and immediately called for help.
The plane had arrived in NY from Charlotte at 10:45 p.m. Monday and was being prepared for a morning departure.More news: Donald Trump Insults LeBron James' Intelligence on Twitter
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The plane was removed from the tarmac Tuesday night for further investigation, according to the report. "We will release cause and manner of death upon determination", a spokesperson with the medical examiner's office said.
The Port Authority Police Department handed over the investigation.
In a separate incident on the other side of the world, a dead baby was found in the toilet of an AirAsia flight in India late last month.
The Queens District Attorney's office is looking into the matter, a spokeswoman confirmed to CNN, adding that they may have additional information to share Tuesday afternoon. "I think it's terrible".