(CNN) The human fetus discovered Tuesday in a plane lavatory at LaGuardia Airport in New York had a gestational age of 5 months, scientists at the city's Office of Chief Medical Examiner have determined. 
 
 The revelation came a day after an American Airlines crew found what they said appeared to be a fetus during a scheduled cleaning, according to the airline. 
 
 No further details about the scientists' findings were immediately available, spokeswoman Aja Worthy-Davis said Wednesday. 
 
 The plane arrived late Monday at LaGuardia from Charlotte, North Carolina, and the discovery was made around 5 a.m. Tuesday, airline spokesman Justin Franco told CNN. 
 
 The cleaning crew immediately contacted a manager, who contacted law enforcement, Franco said. 
 
 Read More ||||| A human fetus was found on an American Airlines flight on Tuesday morning. 
 
 American Airlines spokesperson Justin Franco told TIME that flight 1429 came in to La Guardia Airport from Charlotte, N. C., Monday and was parked overnight. A cleaner readying the flight so it could go back to Charlotte on Tuesday morning discovered the fetus, Franco said. 
 
 The cleaner notified a supervisor, who contacted law enforcement. 
 
 The New York City Chief Medical Examiner’s office is investigating the fetus to determine exactly how it died, a spokesperson told TIME. 
 
 Franco said the airline is “working with law enforcement to piece together what happened.” 
 
 “As we continue to learn more about this tragic and sensitive situation, we are actively cooperating with law enforcement in their investigation,” reads a statement from American Airlines. 
 
 The flight was delayed in returning to Charlotte on Tuesday morning, and passengers were accommodated, Franco said. The plane is back in passenger service now.
– American Airlines and New York authorities are investigating after a fetus was found in the lavatory of a plane that arrived at LaGuardia Airport from Charlotte, NC, on Monday. The plane was parked overnight before a cleaner discovered the fetus around 5am Tuesday, report CNN and Time. "As we continue to learn more about this tragic and sensitive situation, we are actively cooperating with law enforcement in their investigation," American Airlines says in a statement. The Queens District Attorney is investigating.