An organ has been recovered from the wreck of the plane carrying the Argentinian-born professional football player Emiliano Sala and pilot David Ibbotson, the airline (AAIB) in Britain said late on Wednesday.
The agency did not reveal the body's identity.
The body was "successfully restored", but attempts to regain the plane's wreck failed, AAIB said in a statement. The overall operation was brought to an end due to "bad weather", the agency said.
Sala, 28, was on his way from Nantes in western France on January 21 to make his debut for the Premier League team Cardiff City when the plane disappeared over the English channel.
The wreck was found Sunday after a privately funded underwater search.
Sala had agreed to join the Welsh club Cardiff for a record fee of 1
Nantes has requested payment from Cardiff City for the first installment of the Sala Transfer Fee, a source that has been confirmed to ESPN FC earlier on Wednesday. Cardiff plans to respect their financial commitment to the agreement but had withheld the transfer fee until the investigation of the incident had ended. Nantes requires the first installment to be paid within 10 days of the threat of litigation.
Reuters has contributed to this report.