This is similar to the way people address the Concorde aircraft:
Why does everyone say 'I flew on Concorde' or 'Concorde landed while I was at heathrow', etc. You don't hear people saying 'TriStar landed while I was at Luton airport' or 'We flew on 146'! It's not like there's just one of them, there were about 14 doing the rounds at one point.
But thinking about it, does it really matter? It just sounds better over the r/t if a little extravagant?