Only one Boeing 767-300—the non-Extended Range variant—remains operational, but not for long. Aeroroutes information—as shown in Cirium Diio, OAG, etc.—shows that the Asiana aircraft will carry its last passengers on March 29, the last day of the northern aviation winter season based on IATA slot seasons. However, examples abound of where a planned retirement is extended, which is good if you think about it.