The Scot was manager in 1958 and on the plane carrying his 'Babes' which crashed at a Munich Airport and claimed the lives of 23, including eight players.
Despite being seriously injured, Sir Matt would recover and go on to build an iconic United side which would lift the European Cup a decade later.
Following his death his family continued to receive tickets for the director's box.
However, the plaque has been removed and new tickets, for a separate area of the stadium which include hospitality, have been issued.