The American Airlines' jet had originated in Charlotte and had been parked in a hangar when the foetus was discovered early on Tuesday morning, the station said.
The fetus was believed to be five or six months along.
A dead fetus was found on-board a plane at LaGuardia Airport in New York City on Tuesday.
A dead fetus was found on a plane that flew to NY from Charlotte Monday night.
American Airlines also sent out an official statement, but offered no details about what had been found.
The fetus was found at about 7 a.m. on an American Airlines flight that had landed Monday night from Charlotte. "We will release determination when investigation is complete". "Please check with @AmericanAir before your departure", the post said.
Matt Miller, a spokesperson for American Airlines told USA TODAY, the airline is cooperating with law enforcement in its investigation of "this tragic and sensitive situation".
LGA Airport officials tweeted that travelers may experience a delay due to an "out of service aircraft".