Tokyo , Japan ( CNN ) -- A body was found in the landing gear bay of an airplane that arrived at Tokyo 's Narita Airport Sunday , the airport announced . The dead man was not carrying a passport or personal belongings , airport police said . The man was of dark complexion and dressed in blue jeans and a red and dark blue long-sleeved shirt , police told CNN . Police said he possibly froze to death and suffered a shortage of oxygen at high altitude , but did not provide a definite cause of death pending an autopsy . A mechanic found the body in the landing gear bay , which was impossible to enter from the cabin , the airport said . The Boeing 777 , Delta Flight 59 , which departed New York 's John F. Kennedy International Airport at 12:53 p.m . ET Saturday arrived at Narita at 4:46 p.m. local time Sunday , the airport said . `` Delta is fully co-operating with the Japanese authorities , and there is ( an ) on-going investigation which is being led by the Japanese authorities . The airline has not issued an official statement at this time , '' a Delta representative told CNN . CNN 's Junko Ogura and Ayesha Durgahee contributed to this report .
Flight left New York 's John F. Kennedy airport Saturday afternoon . The plane was carrying the bodies of two Americans killed in a crash on Sunday, and their families were expected to arrive at Andrews Air Force Base later Saturday. Dead man had no passport or personal belongings .