The reason for the revision to the 79s and them terminating at Salford Quays is due to the fact that whenever Man Utd have their home matches it can actually had another hour to the journey time from Salford Quays to Stretford especially at full time, I remember when it was a 69 by the time we got to Stretford the 69 behind us had actually caught us up.
Now whether the changes to 79 are only when there's home matches/events at Old Trafford I'm not too sure
RE: Arriva Bolton